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Planarian stem cell colony
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Planarians are freshwater flatworms that have powerful abilities to regenerate their bodies, which would seem to make them natural model organisms in which to study stem cells. Peter Reddien, Whitehead Institute View Media
CRISPR 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 Media
CRISPR Illustration
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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
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
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
Cross section of a Drosophila melanogaster pupa
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This photograph shows a magnified view of a Drosophila melanogaster pupa in cross section. Compare this normal pupa to one that lacks an important receptor, shown in image 2759. Christina McPhee and Eric Baehrecke, University of Massachusetts Medical School 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
Genetic 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 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
Apoptosis 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 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
RNA 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 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
Histone 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 Media
Genetic patchworks
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Each point in these colorful patchworks represents the correlation between two sleep-associated genes in fruit flies. Susan Harbison and Trudy Mackay, North Carolina State University View Media
Lily 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 Media
A molecular interaction network in yeast 3
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The image visualizes a part of the yeast molecular interaction network. Keiichiro Ono, UCSD View Media
DNA replication illustration
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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 Media
Hippocampal 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 Media
Mosaicism in C. elegans (White Background)
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In the worm C. elegans, double-stranded RNA made in neurons can silence matching genes in a variety of cell types through the transport of RNA between cells. Snusha Ravikumar, Ph.D., University of Maryland, College Park, and Antony M. Jose, Ph.D., University of Maryland, College Park View Media
Dynamic cryo-EM model of the human transcription preinitiation complex
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Gene transcription is a process by which information encoded in DNA is transcribed into RNA. Eva Nogales, Berkeley Lab View Media
Lily 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 Media
A 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 Media
