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Tracking embryonic zebrafish cells
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To better understand cell movements in developing embryos, researchers isolated cells from early zebrafish embryos and grew them as clusters. Liliana Solnica-Krezel, Washington University School of Medicine in St. Louis. View Media
Pig trypsin (1)
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A crystal of porcine trypsin protein created for X-ray crystallography, which can reveal detailed, three-dimensional protein structures. Alex McPherson, University of California, Irvine View Media
X-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 Media
Insulin and protein interact in pancreatic beta cells
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A large number of proteins interact with the hormone insulin as it is produced in and secreted from the beta cells of the pancreas. William E. Balch, The Scripps Research Institute 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
Plasma membrane (with labels)
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The plasma membrane is a cell's protective barrier. See image 2523 for an unlabeled version of this illustration. Featured in The Chemistry of Health. Crabtree + Company View Media
Structure of Glutamate Dehydrogenase
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Some children are born with a mutation in a regulatory site on this enzyme that causes them to over-secrete insulin when they consume protein. Judy Coyle, Donald Danforth Plant Science Center View Media
Mapping disease spread
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How far and fast an infectious disease spreads across a community depends on many factors, including transportation. These U.S. David Chrest, RTI International View Media
Clathrin-mediated endocytosis
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Endocytosis is the process by which cells are able to take up membrane and extracellular materials through the formation of a small intracellular bubble, called a vesicle. Janet Iwasa, University of Utah View Media
CRISPR surveillance complex
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This image shows how the CRISPR surveillance complex is disabled by two copies of anti-CRISPR protein AcrF1 (red) and one AcrF2 (light green). NRAMM National Resource for Automated Molecular Microscopy http://nramm.nysbc.org/nramm-images/ Source: Bridget Carragher View Media
Chromium X-ray source
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In the determination of protein structures by X-ray crystallography, this unique soft (l = 2.29Å) X-ray source is used to collect anomalous scattering data from protein crystals containing light atoms The Southeast Collaboratory for Structural Genomics View Media
Bond types
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Ionic and covalent bonds hold molecules, like sodium chloride and chlorine gas, together. Hydrogen bonds among molecules, notably involving water, also play an important role in biology. Crabtree + Company View Media
Drugs enter skin
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Drugs enter different layers of skin via intramuscular, subcutaneous, or transdermal delivery methods. See image 2532 for a labeled version of this illustration. Crabtree + Company View Media
Dynamin Fission
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Time lapse series shows short dynamin assemblies (not visible) constricting a lipid tube to make a "beads on a string" appearance, then cutting off one of the beads i.e., catalyzing membrane fission). Ramachandran, Pucadyil et al. , The Scripps Research Institute View Media
Rhodopsin bound to visual arrestin
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Rhodopsin is a pigment in the rod cells of the retina (back of the eye). It is extremely light-sensitive, supporting vision in low-light conditions. Protein Data Bank. View Media
Cell-like compartments emerging from scrambled frog eggs
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Cell-like compartments spontaneously emerge from scrambled frog eggs, with nuclei (blue) from frog sperm. Endoplasmic reticulum (red) and microtubules (green) are also visible. Xianrui Cheng, Stanford University School of Medicine. View Media
RNA folding in action
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An RNA molecule dynamically refolds itself as it is being synthesized. When the RNA is short, it ties itself into a “knot” (dark purple). Julius Lucks, Northwestern University View Media
3-D Architecture of a Synapse
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This image shows the structure of a synapse, or junction between two nerve cells in three dimensions. From the brain of a mouse. Anton Maximov, The Scripps Research Institute, La Jolla, CA View Media
Protein from Arabidopsis thaliana
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NMR solution structure of a plant protein that may function in host defense. This protein was expressed in a convenient and efficient wheat germ cell-free system. Center for Eukaryotic Structural Genomics View Media
Active site of sulfite oxidase
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Sulfite oxidase is an enzyme that is essential for normal neurological development in children. John Enemark, University of Arizona View Media
Proteasome
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This fruit fly spermatid recycles various molecules, including malformed or damaged proteins. Sigi Benjamin-Hong, Rockefeller University View Media
Assembly 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 Media
Adult Hawaiian bobtail squid burying in the sand
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Each morning, the nocturnal Hawaiian bobtail squid, Euprymna scolopes, hides from predators by digging into the sand. At dusk, it leaves the sand again to hunt. Margaret J. McFall-Ngai, Carnegie Institution for Science/California Institute of Technology, and Edward G. Ruby, California Institute of Technology. View Media
Ribbon diagram of a cefotaxime-CCD-1 complex
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CCD-1 is an enzyme produced by the bacterium Clostridioides difficile that helps it resist antibiotics. Keith Hodgson, Stanford University. View Media
Rat Hippocampus
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This image of the hippocampus was taken with an ultra-widefield high-speed multiphoton laser microscope. Tom Deerinck, NCMIR View Media
Sea 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 Media
Confocal microscopy of perineuronal nets in the brain 2
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The photo shows a confocal microscopy image of perineuronal nets (PNNs), which are specialized extracellular matrix (ECM) structures in the brain. Tom Deerinck, National Center for Microscopy and Imaging Research (NCMIR) View Media
Rotavirus structure
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This image shows a computer-generated, three-dimensional map of the rotavirus structure. This virus infects humans and other animals and causes severe diarrhea in infants and young children. Bridget Carragher, The Scripps Research Institute, La Jolla, CA View Media
Cell division phases in Xenopus frog cells
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These images show three stages of cell division in Xenopus XL177 cells, which are derived from tadpole epithelial cells. They are (from top): metaphase, anaphase and telophase. Claire Walczak, who took them while working as a postdoc in the laboratory of Timothy Mitchison View Media
Crystals of CCD-1 in complex with cefotaxime
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CCD-1 is an enzyme produced by the bacterium Clostridioides difficile that helps it resist antibiotics. Keith Hodgson, Stanford University. View Media
Folding@Home
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Stanford University scientist Vijay Pande decided to couple the power of computers with the help of the public. Judith Stoffer View Media
Beta2-adrenergic receptor protein
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Crystal structure of the beta2-adrenergic receptor protein. The Stevens Laboratory, The Scripps Research Institute View Media
Floral pattern in a mixture of two bacterial species, Acinetobacter baylyi and Escherichia coli, grown on a semi-solid agar for 48 hours (photo 2)
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Floral pattern emerging as two bacterial species, motile Acinetobacter baylyi (red) and non-motile Escherichia coli (green), are grown together for 48 hours on 1% agar surface from a sma L. Xiong et al, eLife 2020;9: e48885 View Media
Cell-free protein synthesizers
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Both instruments shown were developed by CellFree Sciences of Yokohama, Japan. Center for Eukaryotic Structural Genomics View Media
Nerve and glial cells in fruit fly embryo
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Glial cells (stained green) in a fruit fly developing embryo have survived thanks to a signaling pathway initiated by neighboring nerve cells (stained red). Hermann Steller, Rockefeller 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
Pathways – Bacteria vs. Viruses: What's the Difference?
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Learn about how bacteria and viruses differ, how they each can make you sick, and how they can or cannot be treated. National Institute of General Medical Sciences View Media
Glowing glycans
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Sugars light up the cells in this jaw of a 3-day-old zebrafish embryo and highlight a scientific first: labeling and tracking the movements of sugar chains called glycans in a living organism. Carolyn Bertozzi, University of California, Berkeley 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
Most 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 Media
Tiny strands of tubulin, a protein in a cell's skeleton
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Just as our bodies rely on bones for structural support, our cells rely on a cellular skeleton. Pakorn Kanchanawong, National University of Singapore and National Heart, Lung, and Blood Institute, National Institutes of Health; and Clare Waterman, National Heart, Lung, and Blood Institute, National Institutes of Health View Media
Fruit fly brain responds to adipokines
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Drosophila adult brain showing that an adipokine (fat hormone) generates a response from neurons (aqua) and regulates insulin-producing neurons (red).Akhila Rajan, Fred Hutchinson Cancer Center View Media
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 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
Respiratory droplet
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This painting shows a cross section of a small respiratory droplet, like the ones that are thought to transmit SARS-CoV-2, the virus that causes COVID-19. Amy Wu and Christine Zardecki, RCSB Protein Data Bank. 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
Myelinated axons 2
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Top view of myelinated axons in a rat spinal root. Tom Deerinck, National Center for Microscopy and Imaging Research (NCMIR) View Media
Petri dish containing C. elegans
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This Petri dish contains microscopic roundworms called Caenorhabditis elegans. Researchers used these particular worms to study how C. H. Robert Horvitz and Dipon Ghosh, Massachusetts Institute of Technology. View Media
