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This is a searchable collection of scientific photos, illustrations, and videos. The images and videos in this gallery are licensed under Creative Commons Attribution Non-Commercial ShareAlike 3.0. This license lets you remix, tweak, and build upon this work non-commercially, as long as you credit and license your new creations under identical terms.
Chromosomes before crossing over
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Duplicated pair of chromosomes lined up and ready to cross over. Judith Stoffer View MediaPulsating response to stress in bacteria - video
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By attaching fluorescent proteins to the genetic circuit responsible for B. subtilis's stress response, researchers can observe the cells' pulses as green flashes. Michael Elowitz, Caltech University View MediaNucleotides make up DNA (with labels)
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DNA consists of two long, twisted chains made up of nucleotides. Each nucleotide contains one base, one phosphate molecule, and the sugar molecule deoxyribose. Crabtree + Company View MediaRecombinant DNA (with labels)
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To splice a human gene (in this case, the one for insulin) into a plasmid, scientists take the plasmid out of an E. Crabtree + Company View MediaTelomeres on outer edge of nucleus during cell division
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New research shows telomeres moving to the outer edge of the nucleus after cell division, suggesting these caps that protect chromosomes also may play a role in organizing DNA. Laure Crabbe, Jamie Kasuboski and James Fitzpatrick, Salk Institute for Biological Studies View MediaRNA strand (with labels)
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Ribonucleic acid (RNA) has a sugar-phosphate backbone and the bases adenine (A), cytosine (C), guanine (G), and uracil (U). Featured in The New Genetics. Crabtree + Company View MediaDisease-resistant Arabidopsis leaf
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This is a magnified view of an Arabidopsis thaliana leaf a few days after being exposed to the pathogen Hyaloperonospora arabidopsidis. Jeff Dangl, University of North Carolina, Chapel Hill View MediaSnowflake DNA origami
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An atomic force microscopy image shows DNA folded into an intricate, computer-designed structure. The image is featured on Biomedical Beat blog post Cool Images: A Holiday-Themed Collection. Hao Yan, Arizona State University View MediaCRISPR Illustration Frame 5
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This illustration shows, in simplified terms, how the CRISPR-Cas9 system can be used as a gene-editing tool. This is the fifthframe in a series of five. View MediaDNA replication illustration (with labels)
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During DNA replication, each strand of the original molecule acts as a template for the synthesis of a new, complementary DNA strand. Crabtree + Company View MediaA chromosome goes missing in anaphase
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Anaphase is the critical step during mitosis when sister chromosomes are disjoined and directed to opposite spindle poles, ensuring equal distribution of the genome during cell division. View MediaBottles of warfarin
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In 2007, the FDA modified warfarin's label to indicate that genetic makeup may affect patient response to the drug. The widely used blood thinner is sold under the brand name Coumadin®. Alisa Machalek, NIGMS/NIH View MediaGlowing bacteria make a pretty postcard
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This tropical scene, reminiscent of a postcard from Key West, is actually a petri dish containing an artistic arrangement of genetically engineered bacteria. Nathan C. Shaner, The Scintillon Institute View MediaGenetically identical mycobacteria respond differently to antibiotic 2
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Antibiotic resistance in microbes is a serious health concern. So researchers have turned their attention to how bacteria undo the action of some antibiotics. Bree Aldridge, Tufts University View MediaLily mitosis 13
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A light microscope image of cells from the endosperm of an African globe lily (Scadoxus katherinae). This is one frame of a time-lapse sequence that shows cell division in action. Andrew S. Bajer, University of Oregon, Eugene View MediaFruit fly ovarioles
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Three fruit fly (Drosophila melanogaster) ovarioles (yellow, blue, and magenta) with egg cells visible inside them. Ovarioles are tubes in the reproductive systems of female insects. Vladimir I. Gelfand, Feinberg School of Medicine, Northwestern University. View MediaHaplotypes (with labels)
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Haplotypes are combinations of gene variants that are likely to be inherited together within the same chromosomal region. Crabtree + Company View MediaXenopus laevis embryos
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Xenopus laevis, the African clawed frog, has long been used as a model organism for studying embryonic development. The frog embryo on the left lacks the developmental factor Sizzled. Michael Klymkowsky, University of Colorado, Boulder View MediaLily mitosis 01
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A light microscope image shows the chromosomes, stained dark blue, in a dividing cell of an African globe lily (Scadoxus katherinae). Andrew S. Bajer, University of Oregon, Eugene View MediaFruit fly spermatids
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Developing spermatids (precursors of mature sperm cells) begin as small, round cells and mature into long-tailed, tadpole-shaped ones. Lacramioara Fabian, The Hospital for Sick Children, Toronto, Canada View MediaLily mitosis 02
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A light microscope image of a cell from the endosperm of an African globe lily (Scadoxus katherinae). This is one frame of a time-lapse sequence that shows cell division in action. Andrew S. Bajer, University of Oregon, Eugene View MediaRNA interference (with labels)
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RNA interference or RNAi is a gene-silencing process in which double-stranded RNAs trigger the destruction of specific RNAs. Crabtree + Company View MediaChromosomes after crossing over
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Duplicated pair of chromosomes have exchanged material. Judith Stoffer View MediaIntrons (with labels)
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Genes are often interrupted by stretches of DNA (introns, blue) that do not contain instructions for making a protein. Crabtree + Company View MediaInduced stem cells from adult skin 04
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The human skin cells pictured contain genetic modifications that make them pluripotent, essentially equivalent to embryonic stem cells. James Thomson, University of Wisconsin-Madison View MediaFruit fly ovaries
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Fruit fly (Drosophila melanogaster) ovaries with DNA shown in magenta and actin filaments shown in light blue. This image was captured using a confocal laser scanning microscope.Vladimir I. Gelfand, Feinberg School of Medicine, Northwestern University. View Media
Repairing DNA
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Like a watch wrapped around a wrist, a special enzyme encircles the double helix to repair a broken strand of DNA. Tom Ellenberger, Washington University School of Medicine View MediaCRISPR Illustration Frame 2
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This illustration shows, in simplified terms, how the CRISPR-Cas9 system can be used as a gene-editing tool. National Institute of General Medical Sciences. View MediaAlternative splicing (with labels)
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Arranging exons in different patterns, called alternative splicing, enables cells to make different proteins from a single gene. Featured in The New Genetics. Crabtree + Company View MediaGenetic imprinting in Arabidopsis
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This delicate, birdlike projection is an immature seed of the Arabidopsis plant. The part in blue shows the cell that gives rise to the endosperm, the tissue that nourishes the embryo. Robert Fischer, University of California, Berkeley View MediaCross section of a Drosophila melanogaster pupa lacking Draper
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In the absence of the engulfment receptor Draper, salivary gland cells (light blue) persist in the thorax of a developing Drosophila melanogaster pupa. Christina McPhee and Eric Baehrecke, University of Massachusetts Medical School View MediaZinc finger
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The structure of a gene-regulating zinc finger protein bound to DNA. Jeremy M. Berg, National Institute of General Medical Sciences View MediaHippocampal neuron in culture
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Hippocampal neuron in culture. Dendrites are green, dendritic spines are red and DNA in cell's nucleus is blue. Shelley Halpain, UC San Diego View MediaPrecise development in the fruit fly embryo
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This 2-hour-old fly embryo already has a blueprint for its formation, and the process for following it is so precise that the difference of just a few key molecules can change the plans. Thomas Gregor, Princeton University View MediaFly by night
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This fruit fly expresses green fluorescent protein (GFP) in the same pattern as the period gene, a gene that regulates circadian rhythm and is expressed in all sensory neurons on the surface of the fl Jay Hirsh, University of Virginia View MediaMeiosis illustration
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Meiosis is the process whereby a cell reduces its chromosomes from diploid to haploid in creating eggs or sperm. Crabtree + Company View MediaLily mitosis 07
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A light microscope image of a cell from the endosperm of an African globe lily (Scadoxus katherinae). This is one frame of a time-lapse sequence that shows cell division in action. Andrew S. Bajer, University of Oregon, Eugene View MediaBrain showing hallmarks of Alzheimer's disease
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Along with blood vessels (red) and nerve cells (green), this mouse brain shows abnormal protein clumps known as plaques (blue). Alvin Gogineni, Genentech View MediaLily mitosis 10
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A light microscope image of a cell from the endosperm of an African globe lily (Scadoxus katherinae). This is one frame of a time-lapse sequence that shows cell division in action. Andrew S. Bajer, University of Oregon, Eugene View MediaApoptosis reversed
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Two healthy cells (bottom, left) enter into apoptosis (bottom, center) but spring back to life after a fatal toxin is removed (bottom, right; top). Hogan Tang of the Denise Montell Lab, Johns Hopkins University School of Medicine View MediaFruit fly ovary_2
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A fruit fly ovary, shown here, contains as many as 20 eggs. Fruit flies are not merely tiny insects that buzz around overripe fruit--they are a venerable scientific tool. Denise Montell, University of California, Santa Barbara View MediaEarly development in Arabidopsis
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Early on, this Arabidopsis plant embryo picks sides: While one end will form the shoot, the other will take root underground. Zachery R. Smith, Jeff Long lab at the Salk Institute for Biological Studies View MediaZebrafish larva
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You are face to face with a 6-day-old zebrafish larva. What look like eyes will become nostrils, and the bulges on either side will become eyes. Oscar Ruiz and George Eisenhoffer, University of Texas MD Anderson Cancer Center, Houston View MediaMeiosis illustration (with labels)
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Meiosis is the process whereby a cell reduces its chromosomes from diploid to haploid in creating eggs or sperm. Crabtree + Company View MediaDicty fruit
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Dictyostelium discoideum is a microscopic amoeba. A group of 100,000 form a mound as big as a grain of sand. Featured in The New Genetics. View MediaDividing cell in metaphase
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This image of a mammalian epithelial cell, captured in metaphase, was the winning image in the high- and super-resolution microscopy category of the 2012 GE Healthcare Life Sciences Cell Imaging Compe Jane Stout in the laboratory of Claire Walczak, Indiana University, GE Healthcare 2012 Cell Imaging Competition View MediaHistone deacetylases
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The human genome contains much of the information needed for every cell in the body to function. However, different types of cells often need different types of information. Amy Wu and Christine Zardecki, RCSB Protein Data Bank. View MediaNucleolus subcompartments spontaneously self-assemble 2
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The nucleolus is a small but very important protein complex located in the cell's nucleus. Nilesh Vaidya, Princeton University View MediaA multicolored fish scale 2
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Each of the tiny colored specs in this image is a cell on the surface of a fish scale. Chen-Hui Chen and Kenneth Poss, Duke University View MediaTrypanosoma brucei, the cause of sleeping sickness
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Trypanosoma brucei is a single-cell parasite that causes sleeping sickness in humans. Michael Rout, Rockefeller University View Media