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    Inner structure of a typical bacterial cell, illustration. Bacterial cells do not have a membrane-bound nucleus or organelles — Stock Photo
    Inner structure of a typical bacterial cell, illustration. Bacterial cells do not have a membrane-bound nucleus or organelles
    Blood clot, computer illustration — Stock Photo
    Blood clot, computer illustration
    LDL receptors on cell membrane, illustration — Stock Photo
    LDL receptors on cell membrane, illustration
    Blood clot, computer illustration — Stock Photo
    Blood clot, computer illustration
    Illustration showing the bacterial transformation process. A Neisseria gonorrhoeae bacterium releases chromosomal DNA (deoxyribonucleic acid, blue centre) with antibiotic resistance genes (yellow, centre) into the environment via lysis — Stock Photo
    Illustration showing the bacterial transformation process. A Neisseria gonorrhoeae bacterium releases chromosomal DNA (deoxyribonucleic acid, blue centre) with antibiotic resistance genes (yellow, centre) into the environment via lysis
    Human Teeth, computer illustration — Stock Photo
    Human Teeth, computer illustration
    3d illustration of the nucleus inside a eukaryotic cell. The nucleus contains the cell's genetic information in the form of DNA (deoxyribonucleic acid). The DNA is complexed with proteins and stored as chromatin — Stock Photo
    3d illustration of the nucleus inside a eukaryotic cell. The nucleus contains the cell's genetic information in the form of DNA (deoxyribonucleic acid). The DNA is complexed with proteins and stored as chromatin
    Activated platelets in a blood smear with red blood cells, illustration. — Stock Photo
    Activated platelets in a blood smear with red blood cells, illustration.
    Conceptual illustration of viral encephalitis is an inflammation of the brain caused by a virus. — Stock Photo
    Conceptual illustration of viral encephalitis is an inflammation of the brain caused by a virus.
    Illustration of platelets (thrombocytes) that have been activated (with extensions) and those that are non-activated. Platelets are part of the blood. When a blood vessel is damaged, the platelets become activated and secrete chemicals that cause the — Stock Photo
    Illustration of platelets (thrombocytes) that have been activated (with extensions) and those that are non-activated. Platelets are part of the blood. When a blood vessel is damaged, the platelets become activated and secrete chemicals that cause the
    Ulna bone, computer illustration — Stock Photo
    Ulna bone, computer illustration
    This image is one of a sequence of three, showing the break-up of a small moon due to the gravitational field of its giant parent planet — Stock Photo
    This image is one of a sequence of three, showing the break-up of a small moon due to the gravitational field of its giant parent planet
    Illustration of a dendritic cell (centre, purple) activating T-cells (teal). Dendritic cells recognise viruses and present information about their antigens to T-cells — Stock Photo
    Illustration of a dendritic cell (centre, purple) activating T-cells (teal). Dendritic cells recognise viruses and present information about their antigens to T-cells
    Activated platelets, computer illustration — Stock Photo
    Activated platelets, computer illustration
    Covid-19 coronavirus, conceptual illustration. The new coronavirus SARS-CoV-2 (previously 2019-CoV) emerged in Wuhan, China, in December 2019 — Stock Photo
    Covid-19 coronavirus, conceptual illustration. The new coronavirus SARS-CoV-2 (previously 2019-CoV) emerged in Wuhan, China, in December 2019
    Cancer cells, computer illustration — Stock Photo
    Cancer cells, computer illustration
    Tumour growth, computer illustration — Stock Photo
    Tumour growth, computer illustration
    Jaw bone, computer illustration — Stock Photo
    Jaw bone, computer illustration
    Thoracic spine, computer illustration — Stock Photo
    Thoracic spine, computer illustration
    Hip bone, computer illustration — Stock Photo
    Hip bone, computer illustration
    Illustration of platelets (thrombocytes) that have been activated (with extensions) and those that are non-activated. Platelets are part of the blood. When a blood vessel is damaged, the platelets become activated and secrete chemicals that cause the — Stock Photo
    Illustration of platelets (thrombocytes) that have been activated (with extensions) and those that are non-activated. Platelets are part of the blood. When a blood vessel is damaged, the platelets become activated and secrete chemicals that cause the
    Human brain with highlighted corpus callosum, also known as callosal commissure, illustration. It is a wide, thick nerve tract connecting the left and right cerebral hemispheres. — Stock Photo
    Human brain with highlighted corpus callosum, also known as callosal commissure, illustration. It is a wide, thick nerve tract connecting the left and right cerebral hemispheres.
    Jaw bone, computer illustration — Stock Photo
    Jaw bone, computer illustration
    Illustration of Klebsiella pneumoniae bacteria. K. pneumoniae are Gram-negative, encapsulated, non-motile, enteric, rod-shaped bacteria. This species causes Friedlander's pneumonia and urinary tract infections — Stock Photo
    Illustration of Klebsiella pneumoniae bacteria. K. pneumoniae are Gram-negative, encapsulated, non-motile, enteric, rod-shaped bacteria. This species causes Friedlander's pneumonia and urinary tract infections
    Knee joint, computer illustration — Stock Photo
    Knee joint, computer illustration
    Rabies virus, illustration. Rabies virus is a member of the Rhabdoviridae family. This bullet-shaped enveloped virus has a protein coat (capsid, blue), which is made up of helically arranged subunits called capsomeres — Stock Photo
    Rabies virus, illustration. Rabies virus is a member of the Rhabdoviridae family. This bullet-shaped enveloped virus has a protein coat (capsid, blue), which is made up of helically arranged subunits called capsomeres
    Hand bones, computer illustration — Stock Photo
    Hand bones, computer illustration
    An impression of the Red Planet, Mars, second smallest in the Solar System (after Mercury). — Stock Photo
    An impression of the Red Planet, Mars, second smallest in the Solar System (after Mercury).
    Human Lunate, computer illustration — Stock Photo
    Human Lunate, computer illustration
    Popliteus muscle, computer illustration — Stock Photo
    Popliteus muscle, computer illustration
    Lumbar spine, computer illustration — Stock Photo
    Lumbar spine, computer illustration
    Lumbar spine, computer illustration — Stock Photo
    Lumbar spine, computer illustration
    Illustration of antibodies (y-shaped) responding to an infection with the new coronavirus SARS-CoV-2 — Stock Photo
    Illustration of antibodies (y-shaped) responding to an infection with the new coronavirus SARS-CoV-2
    Cancer cells, computer illustration — Stock Photo
    Cancer cells, computer illustration
    Illustration of a view over the rim of a crater on Mars. Mars is the fourth planet in our Solar System, and the subject of more space missions than any other world. — Stock Photo
    Illustration of a view over the rim of a crater on Mars. Mars is the fourth planet in our Solar System, and the subject of more space missions than any other world.
    Human brain with highlighted corpus callosum, also known as callosal commissure, illustration. It is a wide, thick nerve tract connecting the left and right cerebral hemispheres. — Stock Photo
    Human brain with highlighted corpus callosum, also known as callosal commissure, illustration. It is a wide, thick nerve tract connecting the left and right cerebral hemispheres.
    Human brain with highlighted corpus callosum, also known as callosal commissure, illustration. It is a wide, thick nerve tract connecting the left and right cerebral hemispheres. — Stock Photo
    Human brain with highlighted corpus callosum, also known as callosal commissure, illustration. It is a wide, thick nerve tract connecting the left and right cerebral hemispheres.
    Finely structured network, 3d illustration. — Stock Photo
    Finely structured network, 3d illustration.
    Red blood cells. Coloured scanning electron micrograph (SEM) of red blood cells (RBCs, erythrocytes). Red blood cells are biconcave, disc-shaped cells that transport oxygen from the lungs to body cells — Stock Photo
    Red blood cells. Coloured scanning electron micrograph (SEM) of red blood cells (RBCs, erythrocytes). Red blood cells are biconcave, disc-shaped cells that transport oxygen from the lungs to body cells
    Knee joint, computer illustration — Stock Photo
    Knee joint, computer illustration
    Human Metacarpals, computer illustration — Stock Photo
    Human Metacarpals, computer illustration
    Triquetrum bone, computer illustration — Stock Photo
    Triquetrum bone, computer illustration
    Illustration of the ultrastructure of the SARS-CoV-2 coronavirus (previously 2019-nCoV) that was first identified in Wuhan, China, in December 2019. It is an enveloped RNA (ribonucleic acid) virus — Stock Photo
    Illustration of the ultrastructure of the SARS-CoV-2 coronavirus (previously 2019-nCoV) that was first identified in Wuhan, China, in December 2019. It is an enveloped RNA (ribonucleic acid) virus
    Purple Macrophage, computer illustration — Stock Photo
    Purple Macrophage, computer illustration
    Red blood cells. Coloured scanning electron micrograph (SEM) of red blood cells (RBCs, erythrocytes). Red blood cells are biconcave, disc-shaped cells that transport oxygen from the lungs to body cells — Stock Photo
    Red blood cells. Coloured scanning electron micrograph (SEM) of red blood cells (RBCs, erythrocytes). Red blood cells are biconcave, disc-shaped cells that transport oxygen from the lungs to body cells
    Illustration of an oblique view of the giant Valles Marineris canyon system on Mars. The Valles Marineris is over 3000 kilometres long and up to 8 kilometres deep, dwarfing the Grand Canyon of Arizona, USA — Stock Photo
    Illustration of an oblique view of the giant Valles Marineris canyon system on Mars. The Valles Marineris is over 3000 kilometres long and up to 8 kilometres deep, dwarfing the Grand Canyon of Arizona, USA
    Round worms in human intestine, illustration. Roundworms, or nematodes, include numerous free-living and pathogenic species — Stock Photo
    Round worms in human intestine, illustration. Roundworms, or nematodes, include numerous free-living and pathogenic species
    Computer illustration of the basal ganglia, showing caudate nucleus (green), putamen (yellow), and lateral ventricles (blue). — Stock Photo
    Computer illustration of the basal ganglia, showing caudate nucleus (green), putamen (yellow), and lateral ventricles (blue).
    Illustration of a vast dust storm on Mars. Mars is the fourth planet in our Solar System, and the subject of more space missions than any other world — Stock Photo
    Illustration of a vast dust storm on Mars. Mars is the fourth planet in our Solar System, and the subject of more space missions than any other world
    Conceptual illustration of viral encephalitis is an inflammation of the brain caused by a virus. — Stock Photo
    Conceptual illustration of viral encephalitis is an inflammation of the brain caused by a virus.
    3d illustration of Pseudomonas aeruginosa bacteria showing internal structure. These Gram-negative rod-shaped bacteria are found in soil, water and as normal flora in the human intestine — Stock Photo
    3d illustration of Pseudomonas aeruginosa bacteria showing internal structure. These Gram-negative rod-shaped bacteria are found in soil, water and as normal flora in the human intestine
    Unidentified flying object (UFO), illustration. — Stock Photo
    Unidentified flying object (UFO), illustration.
    Macrophage (purple) and cancer cells (red), illustration. — Stock Photo
    Macrophage (purple) and cancer cells (red), illustration.
    Conceptual illustration of viral encephalitis is an inflammation of the brain caused by a virus. — Stock Photo
    Conceptual illustration of viral encephalitis is an inflammation of the brain caused by a virus.
    3d illustration of Coxiella burnetii bacteria. This bacterium affects humans and other animals such as cattle, sheep, goats, cats and dogs. It is the cause of Q fever, a highly infectious, influenza-like, febrile illness — Stock Photo
    3d illustration of Coxiella burnetii bacteria. This bacterium affects humans and other animals such as cattle, sheep, goats, cats and dogs. It is the cause of Q fever, a highly infectious, influenza-like, febrile illness
    Young star, computer illustration. — Stock Photo
    Young star, computer illustration.
    Human Teeth, computer illustration — Stock Photo
    Human Teeth, computer illustration
    Tumour growth, computer illustration — Stock Photo
    Tumour growth, computer illustration
    An impression of the Red Planet, Mars, second smallest in the Solar System (after Mercury) — Stock Photo
    An impression of the Red Planet, Mars, second smallest in the Solar System (after Mercury)
    Thyroid cancer cells, illustration. — Stock Photo
    Thyroid cancer cells, illustration.