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    Chromosome structure and composition — Stock Photo
    Chromosome structure and composition
    3d illustration of normal looking blue colored and transparent x and y chromosomes. — Stock Photo
    3d illustration of normal looking blue colored and transparent x and y chromosomes.
    Simple squamous epithelium, digital illustration. — Stock Photo
    Simple squamous epithelium, digital illustration.
    Campylobacter jejuni bacteria — Stock Photo
    Campylobacter jejuni bacteria
    Group of Trichomonas hominis protozoan parasites, digital illustration. — Stock Photo
    Group of Trichomonas hominis protozoan parasites, digital illustration.
    Digital illustration of Enterobacter Gram-negative bacilli on black background. — Stock Photo
    Digital illustration of Enterobacter Gram-negative bacilli on black background.
    3d illustration of green colored virus particles. — Stock Photo
    3d illustration of green colored virus particles.
    Coronaviruses causing pneumonia, conceptual computer illustration — Stock Photo
    Coronaviruses causing pneumonia, conceptual computer illustration
    Red blood cells — Stock Photo
    Red blood cells
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Antibody 1IGT molecules — Stock Photo
    Antibody 1IGT molecules
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa. — Stock Photo
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa.
    Abstract animal cells, digital illustration. — Stock Photo
    Abstract animal cells, digital illustration.
    Chlamydia bacteria, illustration — Stock Photo
    Chlamydia bacteria, illustration
    Coloured scanning electron micrograph (SEM) of a freeze-fractured Nasturtium stem, showing numerous vascular bundles (such as at upper centre) with an inner xylem (pink) and outer phloem (yellow). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a freeze-fractured Nasturtium stem, showing numerous vascular bundles (such as at upper centre) with an inner xylem (pink) and outer phloem (yellow).
    Four-armed chromosomes — Stock Photo
    Four-armed chromosomes
    Lymphocytes attacking viruses — Stock Photo
    Lymphocytes attacking viruses
    Measles virus particles, digital illustration. — Stock Photo
    Measles virus particles, digital illustration.
    Acute pyelonephritis caused by Acinetobacter baumannii bacteria — Stock Photo
    Acute pyelonephritis caused by Acinetobacter baumannii bacteria
    Colonies of Penicillium fungi grown on Sabouraud Dextrose Agar and digital illustration of fungal morphology. — Stock Photo
    Colonies of Penicillium fungi grown on Sabouraud Dextrose Agar and digital illustration of fungal morphology.
    Scanning electron micrograph of PC12 neurone in culture. — Stock Photo
    Scanning electron micrograph of PC12 neurone in culture.
    Digital artwork showing inclusion composed of group of chlamydia reticulate bodies of Chlamydia trachomatis bacteria. — Stock Photo
    Digital artwork showing inclusion composed of group of chlamydia reticulate bodies of Chlamydia trachomatis bacteria.
    Baby and DNA strand, digital conceptual illustration. — Stock Photo
    Baby and DNA strand, digital conceptual illustration.
    Digital illustration of pollen grain on anther of Chinese hibiscus flower. — Stock Photo
    Digital illustration of pollen grain on anther of Chinese hibiscus flower.
    Human fetus developing at week 29, computer illustration. — Stock Photo
    Human fetus developing at week 29, computer illustration.
    Four-armed chromosomes — Stock Photo
    Four-armed chromosomes
    Hyaline cartilage, a semi-rigid connective tissue — Stock Photo
    Hyaline cartilage, a semi-rigid connective tissue
    Scanning electron microscopy of DNA molecules and red and white blood cells. — Stock Photo
    Scanning electron microscopy of DNA molecules and red and white blood cells.
    Green seedling in glass Petri dish on table. — Stock Photo
    Green seedling in glass Petri dish on table.
    Scientist closing lid of vial while laboratory testing. — Stock Photo
    Scientist closing lid of vial while laboratory testing.
    Conceptual digital illustration showing Giardia intestinalis parasites in drop of water from dirty tap. — Stock Photo
    Conceptual digital illustration showing Giardia intestinalis parasites in drop of water from dirty tap.
    Pollen grains from a bellflower — Stock Photo
    Pollen grains from a bellflower
    Human silhouette with lungs infected by pneumonia caused by flu, illustration. — Stock Photo
    Human silhouette with lungs infected by pneumonia caused by flu, illustration.
    3d illustration of violet bacteria on blue surface. — Stock Photo
    3d illustration of violet bacteria on blue surface.
    Male 3d rendering showing abdominal abs muscles, computer illustration. — Stock Photo
    Male 3d rendering showing abdominal abs muscles, computer illustration.
    Abstract blood vessel with white and red blood cells, digital illustration. — Stock Photo
    Abstract blood vessel with white and red blood cells, digital illustration.
    Blue colored dust mite, digital illustration. — Stock Photo
    Blue colored dust mite, digital illustration.
    Laboratory assistants looking at chemical flask. — Stock Photo
    Laboratory assistants looking at chemical flask.
    Vibrio vulnificus bacteria found in sea water, colored computer illustration. — Stock Photo
    Vibrio vulnificus bacteria found in sea water, colored computer illustration.
    Structure of eosinophil blood cell — Stock Photo
    Structure of eosinophil blood cell
    Pancreatic islet cells. Colored transmission electron micrograph (TEM) of a section through pancreas tissue, showing cells known as Islets of Langerhans. These cells occur in distinct ovoid clusters numbering about 1 million in humans — Stock Photo
    Pancreatic islet cells. Colored transmission electron micrograph (TEM) of a section through pancreas tissue, showing cells known as Islets of Langerhans. These cells occur in distinct ovoid clusters numbering about 1 million in humans
    Coloured scanning electron micrograph of bacteria from culture of breast milk. — Stock Photo
    Coloured scanning electron micrograph of bacteria from culture of breast milk.
    Bacterial cells on tissue surface — Stock Photo
    Bacterial cells on tissue surface
    3d illustration of internal structure of human cell. — Stock Photo
    3d illustration of internal structure of human cell.
    Bacteria on human skin — Stock Photo
    Bacteria on human skin
    Technician hand holding blood sample ready for testing in laboratory. — Stock Photo
    Technician hand holding blood sample ready for testing in laboratory.
    Dendritic cell, computer illustration. A dendritic cell is a type of white blood cell. It is an antigen-presenting cell (APC), which presents antigens to T lymphocytes. — Stock Photo
    Dendritic cell, computer illustration. A dendritic cell is a type of white blood cell. It is an antigen-presenting cell (APC), which presents antigens to T lymphocytes.
    Female scientist posing in laboratory. — Stock Photo
    Female scientist posing in laboratory.
    Visual render of Hepatitis E virus — Stock Photo
    Visual render of Hepatitis E virus
    Conceptual illustration of chicken eggs in carton and magnification of bacterium of food-borne infection on white background. — Stock Photo
    Conceptual illustration of chicken eggs in carton and magnification of bacterium of food-borne infection on white background.
    White blood cell and proteins, digital illustration. — Stock Photo
    White blood cell and proteins, digital illustration.
    Coloured scanning electron micrograph (SEM) of a freeze-fractured Nasturtium stem, showing numerous vascular bundles (such as at upper centre) with an inner xylem (pink) and outer phloem (yellow). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a freeze-fractured Nasturtium stem, showing numerous vascular bundles (such as at upper centre) with an inner xylem (pink) and outer phloem (yellow).
    Smear from oral cavity showing oral trichomonas and buccal epithelial cells, digital illustration. — Stock Photo
    Smear from oral cavity showing oral trichomonas and buccal epithelial cells, digital illustration.
    Transplacental transmission of HIV infecting 8 week human embryo, conceptual illustration. — Stock Photo
    Transplacental transmission of HIV infecting 8 week human embryo, conceptual illustration.
    Eggs of parasitic worm Trichuris trichiura, computer illustration — Stock Photo
    Eggs of parasitic worm Trichuris trichiura, computer illustration
    DNA damage, conceptual illustration. — Stock Photo
    DNA damage, conceptual illustration.
    Parasites attacking spermatozoons fertilizing egg cell. — Stock Photo
    Parasites attacking spermatozoons fertilizing egg cell.
    Bacteria infecting organism — Stock Photo
    Bacteria infecting organism
    Digital labelled illustration showing bacteria causing infections of respiratory and digestive system, Mycobacterium tuberculosis, Helicobacter pylori, Escherichia coli, Shigella. — Stock Photo
    Digital labelled illustration showing bacteria causing infections of respiratory and digestive system, Mycobacterium tuberculosis, Helicobacter pylori, Escherichia coli, Shigella.
    Cancer cells with blood vessel formation — Stock Photo
    Cancer cells with blood vessel formation