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    Stomach lining. Coloured scanning electron micrograph (SEM) of the glandular lining (mucosa) of the stomach. The gastric mucosa secretes the digestive enzymes and hydrochloric acid — Stock Photo
    Stomach lining. Coloured scanning electron micrograph (SEM) of the glandular lining (mucosa) of the stomach. The gastric mucosa secretes the digestive enzymes and hydrochloric acid
    Lymphocyte white blood cell in blood smear, digital illustration. — Stock Photo
    Lymphocyte white blood cell in blood smear, digital illustration.
    Flu viruses, computer illustration — Stock Photo
    Flu viruses, computer illustration
    Lung bronchiole. Light micrograph of a section through lung tissue and a bronchiole. Bronchi form branches from the trachea and gradually diminish in diameter with increasing branching into bronchioles within the lung — Stock Photo
    Lung bronchiole. Light micrograph of a section through lung tissue and a bronchiole. Bronchi form branches from the trachea and gradually diminish in diameter with increasing branching into bronchioles within the lung
    Visual rendering of Human cells — Stock Photo
    Visual rendering of Human cells
    Digital illustration of diseased fatty human heart and cross-section close-up of atherosclerotic plaque histological structure, necrotic centre, foam cells and T-lymphocytes. — Stock Photo
    Digital illustration of diseased fatty human heart and cross-section close-up of atherosclerotic plaque histological structure, necrotic centre, foam cells and T-lymphocytes.
    Animal cells with mitochondria, digital illustration. — Stock Photo
    Animal cells with mitochondria, digital illustration.
    Passion flower pollen — Stock Photo
    Passion flower pollen
    Researcher handling stem cell cultures in laboratory during research. — Stock Photo
    Researcher handling stem cell cultures in laboratory during research.
    Osteoblasts. Colored transmission electron micrograph (TEM) of osteoblasts, bone-producing cells (purple and pink). They contain rough endoplasmic reticulum (RER), which produces, modifies and transports proteins, and nucleus — Stock Photo
    Osteoblasts. Colored transmission electron micrograph (TEM) of osteoblasts, bone-producing cells (purple and pink). They contain rough endoplasmic reticulum (RER), which produces, modifies and transports proteins, and nucleus
    Daisy pollen grain — Stock Photo
    Daisy pollen grain
    Basophil white blood cell and red blood cells, digital illustration. — Stock Photo
    Basophil white blood cell and red blood cells, digital illustration.
    Colored illustration showing abundant lymphoblast cells in human bone marrow smear in acute lymphoblastic leukaemia. — Stock Photo
    Colored illustration showing abundant lymphoblast cells in human bone marrow smear in acute lymphoblastic leukaemia.
    Leukaemia blood cells — Stock Photo
    Leukaemia blood cells
    Digital illustration of green virus particles on plain background. — Stock Photo
    Digital illustration of green virus particles on plain background.
    Plant cells, 3d illustration — Stock Photo
    Plant cells, 3d illustration
    Closeup of Amoeba, computer illustration — Stock Photo
    Closeup of Amoeba, computer illustration
    Crypts of Lieberkuhn. Light micrograph (LM). Crypts of Lieberkuhn of the colon shown in cross section. Crypts are long blind-ending tube-like extensions of the surface epithelial lining of the gut — Stock Photo
    Crypts of Lieberkuhn. Light micrograph (LM). Crypts of Lieberkuhn of the colon shown in cross section. Crypts are long blind-ending tube-like extensions of the surface epithelial lining of the gut
    Cancer cell morphology — Stock Photo
    Cancer cell morphology
    Colored human embryonic stem cells, digital illustration. — Stock Photo
    Colored human embryonic stem cells, digital illustration.
    Closeup of Amoeba, computer illustration — Stock Photo
    Closeup of Amoeba, computer illustration
    Computer illustration of bacterium surrounded by neutrophil white blood cells. — Stock Photo
    Computer illustration of bacterium surrounded by neutrophil white blood cells.
    Human cell, computer illustration — Stock Photo
    Human cell, computer illustration
    Pollen grains of mimosa flower, digital illustration. — Stock Photo
    Pollen grains of mimosa flower, digital illustration.
    Stem cell cultures on weighed in laboratory. — Stock Photo
    Stem cell cultures on weighed in laboratory.
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa. — Stock Photo
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa.
    Cells undergoing mitosis — Stock Photo
    Cells undergoing mitosis
    Flu viruses, computer illustration — Stock Photo
    Flu viruses, computer illustration
    Cancer cell and T cells — Stock Photo
    Cancer cell and T cells
    3d illustration of blue colored virus particles with receptors. — Stock Photo
    3d illustration of blue colored virus particles with receptors.
    Digital illustration of structure of bilayer with phospholipids plasma membrane enclosing cells. — Stock Photo
    Digital illustration of structure of bilayer with phospholipids plasma membrane enclosing cells.
    Nerve cells on blue background, digital illustration. — Stock Photo
    Nerve cells on blue background, digital illustration.
    Measles virus particles, digital illustration. — Stock Photo
    Measles virus particles, digital illustration.
    Adipocyte fat cell — Stock Photo
    Adipocyte fat cell
    Erythrocytes red blood cells in human blood vessel, digital illustration. — Stock Photo
    Erythrocytes red blood cells in human blood vessel, digital illustration.
    Cancer cells with blood vessel formation — Stock Photo
    Cancer cells with blood vessel formation
    Viruses and bacteria, abstract digital illustration. — Stock Photo
    Viruses and bacteria, abstract digital illustration.
    Monocyte and lymphocyte white blood cells in blood smear, digital illustration. — Stock Photo
    Monocyte and lymphocyte white blood cells in blood smear, digital illustration.
    Komodo dragon skin, coloured scanning electron micrograph (SEM). The Komodo dragon (Varanus komodoensis) has armoured scaly skin. It is the largest lizard in the world, reaching over three metres in length — Stock Photo
    Komodo dragon skin, coloured scanning electron micrograph (SEM). The Komodo dragon (Varanus komodoensis) has armoured scaly skin. It is the largest lizard in the world, reaching over three metres in length
    Fat cells, computer illustration — Stock Photo
    Fat cells, computer illustration
    Nipah virus particles, digital artwork. — Stock Photo
    Nipah virus particles, digital artwork.
    3d illustration of blood plasma and components of blood flowing from artery. — Stock Photo
    3d illustration of blood plasma and components of blood flowing from artery.
    Monocyte white blood cell in blood smear, digital illustration. — Stock Photo
    Monocyte white blood cell in blood smear, digital illustration.
    Digital illustration of eosinophil white blood cells with lobed nuclei colored in purple. — Stock Photo
    Digital illustration of eosinophil white blood cells with lobed nuclei colored in purple.
    Fractured myelinated nerve fibres — Stock Photo
    Fractured myelinated nerve fibres
    Protozoan Plasmodium malariae inside red blood cell in the schizont stage, computer illustration — Stock Photo
    Protozoan Plasmodium malariae inside red blood cell in the schizont stage, computer illustration
    3d illustration of human sperm cells in reproductive process. — Stock Photo
    3d illustration of human sperm cells in reproductive process.
    Cross-section of human cartilage and bone, light micrograph. — Stock Photo
    Cross-section of human cartilage and bone, light micrograph.
    Red blood cells — Stock Photo
    Red blood cells
    Protein molecules, 3d illustration — Stock Photo
    Protein molecules, 3d illustration
    Abstract animal cells, digital illustration. — Stock Photo
    Abstract animal cells, digital illustration.
    Cancer cells and blood vessels — Stock Photo
    Cancer cells and blood vessels
    Transparent sperm cells moving towards round blue coloured egg cell. — Stock Photo
    Transparent sperm cells moving towards round blue coloured egg cell.
    Activated T lymphocytes and red blood cells on scanning electron micrograph. — Stock Photo
    Activated T lymphocytes and red blood cells on scanning electron micrograph.
    Illustration of 4 cell stage egg on black background. — Stock Photo
    Illustration of 4 cell stage egg on black background.
    Alzheimer's disease. Illustration of amyloid plaques amongst neurons and neurofibrillary tangles inside neurons. Amyloid plaques are characteristic features of Alzheimer's disease — Stock Photo
    Alzheimer's disease. Illustration of amyloid plaques amongst neurons and neurofibrillary tangles inside neurons. Amyloid plaques are characteristic features of Alzheimer's disease
    Digital 3d colored illustration of cancer cell in process of mitosis. — Stock Photo
    Digital 3d colored illustration of cancer cell in process of mitosis.
    Tendon fibroblast, light micrograph. Haematoxylin and eosin stain. — Stock Photo
    Tendon fibroblast, light micrograph. Haematoxylin and eosin stain.
    3d illustration of transparent sperm cells swimming towards egg cell. — Stock Photo
    3d illustration of transparent sperm cells swimming towards egg cell.
    Platelets in human blood, computer illustration. — Stock Photo
    Platelets in human blood, computer illustration.