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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
Streptococcus bacteria
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Image of Streptococcus, a type (genus) of spherical bacteria that can colonize the throat and back of the mouth. Stroptococci often occur in pairs or in chains, as shown here. Tina Weatherby Carvalho, University of Hawaii at Manoa View Media
Glycan arrays
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The signal is obtained by allowing proteins in human serum to interact with glycan (polysaccharide) arrays. The arrays are shown in replicate so the pattern is clear. Ola Blixt, Scripps Research Institute View Media
Telomerase illustration
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Reactivating telomerase in our cells does not appear to be a good way to extend the human lifespan. Cancer cells reactivate telomerase. Judith Stoffer View Media
Bence Jones protein MLE
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A crystal of Bence Jones protein created for X-ray crystallography, which can reveal detailed, three-dimensional protein structures. Alex McPherson, University of California, Irvine View Media
Mitosis - interphase
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A cell in interphase, at the start of mitosis: Chromosomes duplicate, and the copies remain attached to each other. Judith Stoffer View Media
Average teen circadian cycle
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Circadian rhythms are physical, mental, and behavioral changes that follow a 24-hour cycle. Typical circadian rhythms lead to high energy during the middle of the day (10 a.m. NIGMS View Media
How cilia do the wave
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Thin, hair-like biological structures called cilia are tiny but mighty. Zvonimir Dogic, Brandeis University 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
Carbon building blocks (with examples)
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The arrangement of identical molecular components can make a dramatic difference. For example, carbon atoms can be arranged into dull graphite (left) or sparkly diamonds (right). Crabtree + Company View Media
Vesicular shuttle model
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Animation for the vesicular shuttle model of Golgi transport. Judith Stoffer View Media
Dividing cells showing chromosomes and cell skeleton
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This pig cell is in the process of dividing. The chromosomes (purple) have already replicated and the duplicates are being pulled apart by fibers of the cell skeleton known as microtubules (green). Nasser Rusan, National Heart, Lung, and Blood Institute, National Institutes of Health View Media
Yeast cells with nuclear envelopes and tubulin
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Yeast cells with nuclear envelopes shown in magenta and tubulin shown in light blue. The nuclear envelope defines the borders of the nucleus, which houses DNA. Alaina Willet, Kathy Gould’s lab, Vanderbilt University. View Media
TFIID complex binds DNA to start gene transcription
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Gene transcription is a process by which the genetic information encoded in DNA is transcribed into RNA. Eva Nogales, Berkeley Lab View Media
Zinc levels in a plant leaf
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Zinc is required for the function of more than 300 enzymes, including those that help regulate gene expression, in various organisms including humans. Suzana Car, Dartmouth College View Media
Cerebellum: the brain's locomotion control center
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The cerebellum of a mouse is shown here in cross-section. The cerebellum is the brain's locomotion control center. Thomas Deerinck, National Center for Microscopy and Imaging Research, University of California, San Diego View Media
Jack 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 Media
Zebrafish pigment cell
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Pigment cells are cells that give skin its color. David Parichy, University of Washington View Media
Lily mitosis 09
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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
Cell division with late aligning chromosomes
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This video shows an instance of abnormal mitosis where chromosomes are late to align. Gary Gorbsky, Oklahoma Medical Research Foundation 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 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
Bee venom toxin destroying a cell
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This video condenses 6.5 minutes into less than a minute to show how the toxin in bee venom, called melittin, destroys an animal or bacterial cell. Huey Huang, Rice University View Media
Three muscle fibers; the middle has a defect found in some neuromuscular diseases
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Of the three muscle fibers shown here, the one on the right and the one on the left are normal. The middle fiber is deficient a large protein called nebulin (blue). Christopher Pappas and Carol Gregorio, University of Arizona View Media
Spinal nerve cells
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Neurons (green) and glial cells from isolated dorsal root ganglia express COX-2 (red) after exposure to an inflammatory stimulus (cell nuclei are blue). Lawrence Marnett, Vanderbilt University 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
Early life of a protein
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This illustration represents the early life of a protein—specifically, apomyoglobin—as it is synthesized by a ribosome and emerges from the ribosomal tunnel, which contains the newly formed protein's Silvia Cavagnero, University of Wisconsin, Madison View Media
Bioluminescence in a Tube
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Details about the basic biology and chemistry of the ingredients that produce bioluminescence are allowing scientists to harness it as an imaging tool. Credit: Nathan Shaner, Scintillon Institute. Nathan Shaner, Scintillon Institute View Media
DNase
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Crystals of DNase protein created for X-ray crystallography, which can reveal detailed, three-dimensional protein structures. Alex McPherson, University of California, Irvine View Media
Brains of sleep-deprived and well-rested fruit flies
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On top, the brain of a sleep-deprived fly glows orange because of Bruchpilot, a communication protein between brain cells. These bright orange brain areas are associated with learning. Chiara Cirelli, University of Wisconsin-Madison 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
Confocal 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 Media
Snowflake yeast 1
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Multicellular yeast called snowflake yeast that researchers created through many generations of directed evolution from unicellular yeast. William Ratcliff, Georgia Institute of Technology. View Media
Mouse retina close-up
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Keunyoung ("Christine") Kim National Center for Microscopy and Imaging Research (NCMIR) View Media
Fibroblasts with nuclei in blue, energy factories in green and the actin cytoskeleton in red
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The cells shown here are fibroblasts, one of the most common cells in mammalian connective tissue. These particular cells were taken from a mouse embryo. Dylan Burnette, NICHD View Media
Fluorescent microscopy of kidney tissue--close-up
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This photograph of kidney tissue, taken using fluorescent light microscopy, shows a close-up view of part of image 3723. Tom Deerinck , National Center for Microscopy and Imaging Research View Media
Smooth muscle from mouse stem cells
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These smooth muscle cells were derived from mouse neural crest stem cells. Red indicates smooth muscle proteins, blue indicates nuclei. Deepak Srivastava, Gladstone Institutes, via CIRM View Media
Movie of in vitro assembly of a cell-signaling pathway
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T cells are white blood cells that are important in defending the body against bacteria, viruses and other pathogens. Xiaolei Su, HHMI Whitman Center of the Marine Biological Laboratory View Media
See 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 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
Influenza 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 Media
STORM image of axonal cytoskeleton
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This image shows the long, branched structures (axons) of nerve cells. Xiaowei Zhuang Laboratory, Howard Hughes Medical Institute, Harvard University View Media
Mouse brain slice showing nerve cells
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A 20-µm thick section of mouse midbrain. The nerve cells are transparent and weren’t stained. Michael Shribak, Marine Biological Laboratory/University of Chicago. View Media
Pathways: What is It? | Why Scientists Study Cells
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Learn how curiosity about the world and our cells is key to scientific discoveries. National Institute of General Medical Sciences View Media
Dynamin structure
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When a molecule arrives at a cell's outer membrane, the membrane creates a pouch around the molecule that protrudes inward. Josh Chappie, National Institute of Diabetes and Digestive and Kidney Diseases, NIH View Media
Mouse Brain Cross Section
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The brain sections are treated with fluorescent antibodies specific to a particular protein and visualized using serial electron microscopy (SEM). Anton Maximov, The Scripps Research Institute, La Jolla, CA View Media
Peripheral nerve cells derived from ES cells
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Peripheral nerve cells made from human embryonic stem cell-derived neural crest stem cells. Stephen Dalton, University of Georgia View Media
Cell-like compartments from frog eggs
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Cell-like compartments that spontaneously emerged 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
Phagosome in macrophage cell
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A sensor particle being engulfed by a macrophage—an immune cell—and encapsuled in a compartment called a phagosome. The phagosome then fuses with lysosomes—another type of compartment. Yan Yu, Indiana University, Bloomington. View Media
Blinking bacteria
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Like a pulsing blue shower, E. coli cells flash in synchrony. Genes inserted into each cell turn a fluorescent protein on and off at regular intervals. Jeff Hasty, University of California, San Diego View Media
