Cellular and Molecular Biology

Illustrations depicting cellular structures, organelles, and processes related to HIV infection and molecular models, highlighting biological interactions and therapies.

Substantia nigra in Parkinson's disease, illustration
Substantia nigra in Parkinson's disease, illustration
149 assets in this story
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Lumbar vertebrae, illustration
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Genital herpes lesions (blisters) on a penis and close-up view of Herpes simplex virus II, computer illustration. Genital herpes is caused by infectio...
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Transplant of hematopoietic stem cells administered to colonize the bone marrow.
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Helicobacter pylori bacteria, illustration
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Hair growth illustration
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Illustration of a womans immune system and the immune reactions that halt progess and eliminate micro-organisms that can invade the organism. A micro-organism (orange cell) present in the organism meets white corpuscles (beige cell) such as macrophages or dendritic cells. The latter can either phagocytose the micro-organisms or destroy them : this is the innate respone; or fragment them and present them to lymphocyte T cells (pink cell). In this way the lymphocyte TCD4 cells, due to the cytokines, will activate the lymphocyte B cells (green cell) which will produce antibodies to destroy the micro-organism. Other lymphocyte TCD8 cells are capable of attacking infected cells by the micro-organism (blue cell in the process of being destroyed) and destroy it.
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Synapse of dopamine neurons that causes the effect of most drugs.
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Bloody artery. Blockage of blood vessels. Sick artery with leukocytes. Blood cells in human vein close-up. Healthy and painful human artery.

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Illustration of a human cell cross-section
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Pink bacteria with tentacles isolated virus cell. Vector germ causing infections, anti body. Virus antibody isolated vector pink bacteria germ
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Illustration of the action principal of a diuretic used in treating autism. The pill lessens the entry of chloride into the neurons by blocking the NKCC1 pump, lowering the concentration of chloride inside the neurons, thus improving neuronal activity and decreasing autistic disorders.
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Human urinary system, illustration
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Illustration of a synapse. When a signal, or action potential, arrives at an axonal terminal, the relevant neurons in the memory release glutamate, the main excitatory neurotransmittor. When the signal arrives in the presynaptic neuron, vesicles containing glutamate merge with the neuron membrane, releasing their contents into the intersynaptic space. In this example, the postsynaptic neuron contains two of the four subtypes of glutamate receptor : NMDA and AMPA. These receptors are channels that respectively let calcium ions and sodium ions through. Generally, the NMDA channel is blocked by a large volume of magesium ion, which prevents the ions from getting through. When glutamate latches onto AMPA receptors, positive ions enter the postsynaptic neuron, stimulating it.
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Human egg cell division, illustration.
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Autophagy, computer illustration. Autophagy (autophagocytosis) is the natural mechanism that destroys unnecessary or dysfunctional cellular components...
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Animal cell structure, illustration
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Cancer cell dividing concept as a microscopic cellular cycle of replication or division of malignant cancerous cells in the human body as a health care medical and oncology symbol for dangerous tumor growth.
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human sensory neuron model for biology studies
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Cloning of a wild Gaur bull. In order to obtain a Gaur calf, the cloning between the genetic code of a wild Gaur bull and the oocyte of a domestic cow is carried out. The genetic code of the Gaur bull is fused with the oocyte from which the nucleus has been removed. This new cell is stimulated to give an embryo. The embryo is implanted in the uterus of another carrier domestic cow. The result thanks to the genetic identity of the Gaur bull, will give a Gaur calf.
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In vitro fertilization, illustration
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Test-tube baby. Conceptual illustration of a foetus in a test tube, representing the concept of in vitro fertilization (IVF), where fertilization occu...
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Transparent capsule on blue background Transparent capsule on blue background Copyright: xZoonar.com/OxanaxRishnyakx 5689227
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4-cell stage embryo, illustration
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Epithelium transitional, illustration.
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Research in cell therapy: obtaining and differentiating embryonic stem cells.
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Nerve cells, computer illustration
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Mummy in sarcophagus. Body of Pharaoh. Egyptian king. Archaeology and Halloween monster. Golden scepter and symbol of immortality. Flat cartoon illustration. Mummy in sarcophagus. Body of Pharaoh.
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Actinomycete bacteria, micrograph and illustration
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Cut of skin seen from 3/4 with the layers (epidermis, dermis, hypodermis, muscle) and its structures.
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Human kidney, illustration and micrograph
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Intestinal villi, light micrograph and 3D computer illustration. Villi are finger-like projections that greatly increase the intestinal surface area f...
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Normal balanced flora of the skin and mucous membranes
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Illustration of how malarial merozoites (Plasmodium) proliferate by using red corpuscles. They penetrate the red corpuscles, ultra rapid transporters, which will allow them to avoid the filtering spleen. The merozoites then produce protein membranes which fix onto the membranes of the red corpuscles. These infected red corpuscles will then fix onto the outside of blood vessels, causing various organs to fail. The sheltered parasites proliferate until they rupture the membrane of the cells after 48 hours, spreading through the blood and parasitising other red corpuscles in order to proliferate again.
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Atherosclerosis, illustration.
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Kissing bug, illustration
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Mitosis, illustration
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Telomere concept isolated and telomeres located on the end caps of a chromosome resulting in aging by damaging DNA or protection resulting in living longer or longevity as a medical microscopic 3D illustration.
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Penetration and replication of the H1N1 virus through a host cell.
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Process of muscle's stiffness and pain / circle type illustration
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Simple columnar epithelium, illustration.
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Illustration of a network of presynaptic and postsynaptic neurons attached to each other by the intersynaptic space which allows nervous impulses to flow, from the upper neuron (top) to the lower neuron (bottom).
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Illustration of the formation of sperm and their genetic diversity, due to interchromosomal genetic mixing during meiosis. At the top, the process of crossing over between two homologous chromosomes (interchromosomal genetic mixing), which increases the genetic diversity of the gametes.
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Medicine: Human anatomy, cell
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Types of human cells Different types of human cells including an egg cell, sperm, red blood cell, osteocyte, neuron, skeletal muscle and columnar epithelial cell. Digital illustration. Copyright: xZoonar.com/AndreaxDantix 17120922
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Fisheries
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In the center, cross-section of capillaries. Above, cross-section of a muscle. Below, cross-section of a nerve (a neuraxon)
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Diagram of the different stages of in vitro fertilization.
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Tap water contaminated by amoeba, illustration
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Bacteriophage consisting of a protein envelope, containing its nucleic acid, and a tail.