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Nucleotides make up DNA
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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 Media
Los ritmos circadianos y el núcleo supraquiasmático
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Los ritmos circadianos son cambios físicos, mentales y de comportamiento que siguen un ciclo de 24 horas. NIGMS View Media
Arabidopsis Thaliana: Flowers Spring to Life
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This image capture shows how a single gene, STM, plays a starring role in plant development. Nathanaёl Prunet NIH Support: National Institute of General Medical Sciences View Media
Lily mitosis 08
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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 Media
Telomeres
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The 46 human chromosomes are shown in blue, with the telomeres appearing as white pinpoints. Hesed Padilla-Nash and Thomas Ried, the National Cancer Institute, a part of NIH View Media
Microscopy image of bird-and-flower DNA origami
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An atomic force microscopy image shows DNA folded into an intricate, computer-designed structure. Hao Yan, Arizona State University View Media
Xenopus 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 Media
Induced stem cells from adult skin 01
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These cells are induced stem cells made from human adult skin cells that were genetically reprogrammed to mimic embryonic stem cells. James Thomson, University of Wisconsin-Madison View Media
Lily mitosis 12
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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 Media
Fruit fly ovary
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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, Johns Hopkins University and University of California, Santa Barbara View Media
Katanin protein regulates anaphase
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The microtubule severing protein, katanin, localizes to chromosomes and regulates anaphase A in mitosis. David Sharp, Albert Einstein College of Medicine View Media
Telomeres 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 Media
Brain 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 Media
CRISPR Illustration Frame 3
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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 Media
Central dogma, illustrated (with labels)
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DNA encodes RNA, which encodes protein. DNA is transcribed to make messenger RNA (mRNA). The mRNA sequence (dark red strand) is complementary to the DNA sequence (blue strand). Crabtree + Company View Media
Life of an AIDS virus (with labels and stages)
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HIV is a retrovirus, a type of virus that carries its genetic material not as DNA but as RNA. Crabtree + Company View Media
RNA Polymerase II
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NIGMS-funded researchers led by Roger Kornberg solved the structure of RNA polymerase II. David Bushnell, Ken Westover and Roger Kornberg, Stanford University View Media
Nucleolus subcompartments spontaneously self-assemble 1
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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 Media
Developing zebrafish fin
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Originally from the waters of India, Nepal, and neighboring countries, zebrafish can now be found swimming in science labs (and home aquariums) throughout the world. Jessica Plavicki View Media
Pollen grains: male germ cells in plants and a cause of seasonal allergies
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Those of us who get sneezy and itchy-eyed every spring or fall may have pollen grains, like those shown here, to blame. Edna, Gil, and Amit Cukierman, Fox Chase Cancer Center, Philadelphia, Pa. View Media
Haplotypes
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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 Media
Symmetrically and asymmetrically elongating cells
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Merged fluorescent images of symmetrically (left) or asymmetrically (right) elongating HeLa cells at the end of early anaphase (magenta) and late anaphase (green). Tomomi Kiyomitsu and Iain M. Cheeseman, Whitehead Institute for Biomedical Research View Media
Automated Worm Sorter - 4
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Georgia Tech associate professor Hang Lu holds a microfluidic chip that is part of a system that uses artificial intelligence and cutting-edge image processing to automatically examine large number of Georgia Tech/Gary Meek View Media
Host infection stimulates antibiotic resistance
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This illustration shows pathogenic bacteria behave like a Trojan horse: switching from antibiotic susceptibility to resistance during infection. View Media
DNA replication origin recognition complex (ORC)
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A study published in March 2012 used cryo-electron microscopy to determine the structure of the DNA replication origin recognition complex (ORC), a semi-circular, protein complex (yellow) that recogni Huilin Li, Brookhaven National Laboratory View Media
Protein formation
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Proteins are 3D structures made up of smaller units. DNA is transcribed to RNA, which in turn is translated into amino acids. NIGMS, with the folded protein illustration adapted from Jane Richardson, Duke University Medical Center View Media
Life of an AIDS virus (with labels)
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HIV is a retrovirus, a type of virus that carries its genetic material not as DNA but as RNA. Crabtree + Company View Media
Zebrafish embryo
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Just 22 hours after fertilization, this zebrafish embryo is already taking shape. By 36 hours, all of the major organs will have started to form. Philipp Keller, Bill Lemon, Yinan Wan, and Kristin Branson, Janelia Farm Research Campus, Howard Hughes Medical Institute, Ashburn, Va. View Media
Cas9 protein involved in the CRISPR gene-editing technology
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In the gene-editing tool CRISPR, a small strand of RNA identifies a specific chunk of DNA. Janet Iwasa View Media
Painted chromosomes
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Like a paint-by-numbers picture, painted probes tint individual human chromosomes by targeting specific DNA sequences. Beth A. Sullivan, Duke University View Media
Dolly the sheep
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Scientists in Scotland were the first to clone an animal, this sheep named Dolly. She later gave birth to Bonnie, the lamb next to her. View Media
RNA interference
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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 Media
RNA 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 Media
Chromosome fiber 01
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This microscopic image shows a chromatin fiber--a DNA molecule bound to naturally occurring proteins. Marc Green and Susan Forsburg, University of Southern California View Media
Highlighted cells
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The cytoskeleton (green) and DNA (purple) are highlighed in these cells by immunofluorescence. Torsten Wittmann, Scripps Research Institute View Media
Induced stem cells from adult skin 03
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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 Media
RSV-Infected Cell
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Viral RNA (red) in an RSV-infected cell. Eric Alonas and Philip Santangelo, Georgia Institute of Technology and Emory University View Media
Dicer generates microRNAs
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The enzyme Dicer generates microRNAs by chopping larger RNA molecules into tiny Velcro®-like pieces. MicroRNAs stick to mRNA molecules and prevent the mRNAs from being made into proteins. Crabtree + Company View Media
Circadian rhythms and the SCN
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Circadian rhythms are physical, mental, and behavioral changes that follow a 24-hour cycle. NIGMS View Media
Genetic mosaicism in fruit flies
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Fat tissue from the abdomen of a genetically mosaic adult fruit fly. Genetic mosaicism means that the fly has cells with different genotypes even though it formed from a single zygote. Akhila Rajan, Fred Hutchinson Cancer Center View Media
Isolated Planarian Pharynx
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The feeding tube, or pharynx, of a planarian worm with cilia shown in red and muscle fibers shown in green View Media
Central dogma, illustrated
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DNA encodes RNA, which encodes protein. DNA is transcribed to make messenger RNA (mRNA). The mRNA sequence (dark red strand) is complementary to the DNA sequence (blue strand). Crabtree + Company View Media
Cross 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 Media
Nucleotides 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 Media
Gene silencing
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Pretty in pink, the enzyme histone deacetylase (HDA6) stands out against a background of blue-tinted DNA in the nucleus of an Arabidopsis plant cell. Olga Pontes and Craig Pikaard, Washington University View Media
From DNA to Protein (labeled)
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The genetic code in DNA is transcribed into RNA, which is translated into proteins with specific sequences. Crabtree + Company View Media
Fruit 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 Media
Circadian rhythm (with labels)
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The human body keeps time with a master clock called the suprachiasmatic nucleus or SCN. Crabtree + Company View Media
Early 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 Media
GFP sperm
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Fruit fly sperm cells glow bright green when they express the gene for green fluorescent protein (GFP). View Media
