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Sea urchin embryo 01
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Stereo triplet of a sea urchin embryo stained to reveal actin filaments (orange) and microtubules (blue). George von Dassow, University of Washington View MediaHydra 03
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Hydra magnipapillata is an invertebrate animal used as a model organism to study developmental questions, for example the formation of the body axis. Hiroshi Shimizu, National Institute of Genetics in Mishima, Japan View MediaSleep and the fly brain
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In the top snapshots, the brain of a sleep-deprived fruit fly glows orange, marking high concentrations of a synaptic protein called Bruchpilot (BRP) involved in communication between neurons. Chiara Cirelli, University of Wisconsin-Madison View MediaMotion in the brain
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Amid a network of blood vessels and star-shaped support cells, neurons in the brain signal each other. The mists of color show the flow of important molecules like glucose and oxygen. Kim Hager and Neal Prakash, University of California, Los Angeles View MediaCryo-EM reveals how the HIV capsid attaches to a human protein to evade immune detection
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The illustration shows the capsid of human immunodeficiency virus (HIV) whose molecular features were resolved with cryo-electron microscopy (cryo-EM). Juan R. Perilla, University of Illinois at Urbana-Champaign View MediaCytoskeleton
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The three fibers of the cytoskeleton--microtubules in blue, intermediate filaments in red, and actin in green--play countless roles in the cell. Judith Stoffer View MediaStructure of heme, top view
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Molecular model of the struture of heme. Heme is a small, flat molecule with an iron ion (dark red) at its center. Rachel Kramer Green, RCSB Protein Data Bank View MediaJack bean concanavalin A
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Crystals of jack bean concanavalin A protein created for X-ray crystallography, which can reveal detailed, three-dimensional protein structures. Alex McPherson, University of California, Irvine View MediaInfluenza virus attaches to host membrane (with labels)
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Influenza A infects a host cell when hemagglutinin grips onto glycans on its surface. Crabtree + Company View MediatRNA splicing enzyme endonuclease in humans
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An NMR solution structure model of the transfer RNA splicing enzyme endonuclease in humans (subunit Sen15). This represents the first structure of a eukaryotic tRNA splicing endonuclease subunit. Center for Eukaryotic Structural Genomics, PSI View MediaSynapses in culture
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Cultured hippocampal neurons grown on a substrate of glial cells (astrocytes). The glial cells form the pink/brown underlayment in this image. The tan threads are the neurons. National Center for Microscopy and Imaging Research View MediaLos 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 MediaDividing cell
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As this cell was undergoing cell division, it was imaged with two microscopy techniques: differential interference contrast (DIC) and confocal. The DIC view appears in blue and shows the entire cell. Dylan T. Burnette, Vanderbilt University School of Medicine. View MediaFocal adhesions (with labels)
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Cells walk along body surfaces via tiny "feet," called focal adhesions, that connect with the extracellular matrix. Crabtree + Company View MediaMouse colon with gut bacteria
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A section of mouse colon with gut bacteria (center, in green) residing within a protective pocket. Sarkis K. Mazmanian, California Institute of Technology View MediaCells lining the blood vessel walls
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The structure of the endothelium, the thin layer of cells that line our arteries and veins, is visible here. Christopher V. Carman and Roberta Martinelli, Harvard Medical School. View MediaHydra 02
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Hydra magnipapillata is an invertebrate animal used as a model organism to study developmental questions, for example the formation of the body axis. Hiroshi Shimizu, National Institute of Genetics in Mishima, Japan View MediaSee how immune cell acid destroys bacterial proteins
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This animation shows the effect of exposure to hypochlorous acid, which is found in certain types of immune cells, on bacterial proteins. American Chemistry Council View MediaConfocal microscopy image of two Drosophila ovarioles
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Ovarioles in female insects are tubes in which egg cells (called oocytes) form at one end and complete their development as they reach the other end of the tube. 2004 Olympus BioScapes Competition View MediaThe nascent juvenile light organ of the Hawaiian bobtail squid
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A light organ (~0.5 mm across) of a Hawaiian bobtail squid, Euprymna scolopes, with different tissues are stained various colors. Margaret J. McFall-Ngai, Carnegie Institution for Science/California Institute of Technology, and Edward G. Ruby, California Institute of Technology. View MediaCell toxins
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A number of environmental factors cause DNA mutations that can lead to cancer: toxins in cigarette smoke, sunlight and other radiation, and some viruses. Judith Stoffer View MediaMost abundant protein in M. tuberculosis
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Model of a protein, antigen 85B, that is the most abundant protein exported by Mycobacterium tuberculosis, which causes most cases of tuberculosis. Mycobacterium Tuberculosis Center, PSI View MediaBioluminescent imaging in adult zebrafish - overhead view
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Luciferase-based imaging enables visualization and quantification of internal organs and transplanted cells in live adult zebrafish. Kenneth Poss, Duke University View MediaBioluminescent imaging in adult zebrafish - lateral view
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Luciferase-based imaging enables visualization and quantification of internal organs and transplanted cells in live adult zebrafish. Kenneth Poss, Duke University View MediaRSV-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 MediaTranslation
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Ribosomes manufacture proteins based on mRNA instructions. Each ribosome reads mRNA, recruits tRNA molecules to fetch amino acids, and assembles the amino acids in the proper order. Judith Stoffer View MediaBioluminescent imaging in adult zebrafish 04
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Luciferase-based imaging enables visualization and quantification of internal organs and transplanted cells in live adult zebrafish. View MediaX-ray crystallography (with labels)
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X-ray crystallography allows researchers to see structures too small to be seen by even the most powerful microscopes. Crabtree + Company View MediaFat cells (red) and blood vessels (green)
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A mouse's fat cells (red) are shown surrounded by a network of blood vessels (green). Daniela Malide, National Heart, Lung, and Blood Institute, National Institutes of Health View MediaSea urchin embryo 02
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Stereo triplet of a sea urchin embryo stained to reveal actin filaments (orange) and microtubules (blue). George von Dassow, University of Washington View MediaAssembly of the HIV capsid
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The HIV capsid is a pear-shaped structure that is made of proteins the virus needs to mature and become infective. John Grime and Gregory Voth, The University of Chicago View MediaGFP sperm
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Fruit fly sperm cells glow bright green when they express the gene for green fluorescent protein (GFP). 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
DDR2 Receptors Attach to Collagen in Breast Tumor
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On the left, the boundary of a breast tumor (yellow) attaches to collagen fibers that are closest to it (green) using DDR2. On the right, a tumor without DDR2 remains disconnected from the collagen. Callie Corsa and Suzanne Ponik, Washington University School of Medicine in St. Louis View MediaHoneybees marked with paint
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Researchers doing behavioral experiments with honeybees sometimes use paint or enamel to give individual bees distinguishing marks. Gene Robinson, University of Illinois at Urbana-Champaign. View MediaBovine milk alpha-lactalbumin (1)
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A crystal of bovine milk alpha-lactalbumin protein created for X-ray crystallography, which can reveal detailed, three-dimensional protein structures. Alex McPherson, University of California, Irvine View MediaEnzyme transition states
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The molecule on the left is an electrostatic potential map of the van der Waals surface of the transition state for human purine nucleoside phosphorylase. Vern Schramm, Albert Einstein College of Medicine of Yeshiva University View MediaCryo-electron tomography of a Caulobacter bacterium
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3D image of Caulobacter bacterium with various components highlighted: cell membranes (red and blue), protein shell (green), protein factories known as ribosomes (yellow), and storage granules Peter Dahlberg, Stanford University. View Media