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    Illustration of thyroid gland in male throat silhouette. — Stock Photo
    Illustration of thyroid gland in male throat silhouette.
    Digitally generated illustration of Penicillium chrysogenum spores, type of fungus producing penicillin. — Stock Photo
    Digitally generated illustration of Penicillium chrysogenum spores, type of fungus producing penicillin.
    Human heart and its electrical system, 3d illustration. The yellow lines demonstrate the electrical (conduction) system of the heart. The heart at right shows an irregular heartbeat (arrhythmia) and atrial fibrillation. — Stock Photo
    Human heart and its electrical system, 3d illustration. The yellow lines demonstrate the electrical (conduction) system of the heart. The heart at right shows an irregular heartbeat (arrhythmia) and atrial fibrillation.
    Vintage UFO saucer in cloudy sky, illustration. — Stock Photo
    Vintage UFO saucer in cloudy sky, illustration.
    Digital illustration of mosquito sucking blood on skin. — Stock Photo
    Digital illustration of mosquito sucking blood on skin.
    Male silhouette with shoulder pain, digital illustration. — Stock Photo
    Male silhouette with shoulder pain, digital illustration.
    Orbital plate of human skull — Stock Photo
    Orbital plate of human skull
    Colored digital illustration of Blastomyces dermatitidis fungus causing fungal infection. — Stock Photo
    Colored digital illustration of Blastomyces dermatitidis fungus causing fungal infection.
    Lyme disease bacteria, digital illustration. — Stock Photo
    Lyme disease bacteria, digital illustration.
    Sitting female silhouette with knee pain, digital illustration. — Stock Photo
    Sitting female silhouette with knee pain, digital illustration.
    Human fetus developing at week 32, computer illustration. — Stock Photo
    Human fetus developing at week 32, computer illustration.
    Thyroid gland cancer with closeup view of cancer cells, computer illustration. — Stock Photo
    Thyroid gland cancer with closeup view of cancer cells, computer illustration.
    Toilet seat microbes, conceptual digital illustration. — Stock Photo
    Toilet seat microbes, conceptual digital illustration.
    Blue human silhouette with visible brain on black background, digital illustration. — Stock Photo
    Blue human silhouette with visible brain on black background, digital illustration.
    Illustration of painful lower back in human skeleton. — Stock Photo
    Illustration of painful lower back in human skeleton.
    Human fetus developing at week 37, computer illustration. — Stock Photo
    Human fetus developing at week 37, computer illustration.
    Healthy internal organs of adult — Stock Photo
    Healthy internal organs of adult
    Human brain anatomy, detailed digital illustration. — Stock Photo
    Human brain anatomy, detailed digital illustration.
    Pacific Ocean view of Earth globe, detailed and photorealistic 3d illustration. — Stock Photo
    Pacific Ocean view of Earth globe, detailed and photorealistic 3d illustration.
    Digital illustration of Mgen Mycoplasma genitalium bacteria. — Stock Photo
    Digital illustration of Mgen Mycoplasma genitalium bacteria.
    Bending female silhouette with foot pain, digital illustration. — Stock Photo
    Bending female silhouette with foot pain, digital illustration.
    Glowing Sun star with solar flares, digital illustration. — Stock Photo
    Glowing Sun star with solar flares, digital illustration.
    Vintage style UFO flying above clouds, illustration. — Stock Photo
    Vintage style UFO flying above clouds, illustration.
    Illustration of silhouette of obese man with visible spine. — Stock Photo
    Illustration of silhouette of obese man with visible spine.
    Structure of cellular organelles — Stock Photo
    Structure of cellular organelles
    Colorful rhinovirus particles in 360-degree panorama view, digital illustration. — Stock Photo
    Colorful rhinovirus particles in 360-degree panorama view, digital illustration.
    Bending on bench male silhouette with knee pain, digital illustration. — Stock Photo
    Bending on bench male silhouette with knee pain, digital illustration.
    Group of cysts of Giardia intestinalis protozoans flagellated parasites in small intestine, digital illustration. — Stock Photo
    Group of cysts of Giardia intestinalis protozoans flagellated parasites in small intestine, digital illustration.
    Red blood cells on white background, digital illustration. — Stock Photo
    Red blood cells on white background, digital illustration.
    Abstract black and white DNA molecules, digital illustration.. — Stock Photo
    Abstract black and white DNA molecules, digital illustration..
    Human brain with highlighted temporal lobe and close-up view of neurons located in temporal lobe, computer illustration — Stock Photo
    Human brain with highlighted temporal lobe and close-up view of neurons located in temporal lobe, computer illustration
    Red blood cells and leukocytes in cross-section of blood vessel, digital illustration. — Stock Photo
    Red blood cells and leukocytes in cross-section of blood vessel, digital illustration.
    Colored illustration of nerve cell on black background. — Stock Photo
    Colored illustration of nerve cell on black background.
    Meningitis bacteria (Neisseria meningitidis), computer illustration — Stock Photo
    Meningitis bacteria (Neisseria meningitidis), computer illustration
    Cancer cells dividing — Stock Photo
    Cancer cells dividing
    Digital network, conceptual illustration — Stock Photo
    Digital network, conceptual illustration
    Human papillomavirus, illustration. Human papilloma virus (HPV) causes warts, which mostly occur on the hands and feet. Certain strains also infect the genitals — Stock Photo
    Human papillomavirus, illustration. Human papilloma virus (HPV) causes warts, which mostly occur on the hands and feet. Certain strains also infect the genitals
    E. coli bacteria in blood stream — Stock Photo
    E. coli bacteria in blood stream
    Illustration of cervical neck in human skeleton on blue background. — Stock Photo
    Illustration of cervical neck in human skeleton on blue background.
    Female silhouette with painful shoulder, digital illustration. — Stock Photo
    Female silhouette with painful shoulder, digital illustration.
    Illustration of human skin anatomy on white background. — Stock Photo
    Illustration of human skin anatomy on white background.
    Magnified digital illustration of megakaryocyte cell. — Stock Photo
    Magnified digital illustration of megakaryocyte cell.
    Illustration of figure of obese man with visible intestine. — Stock Photo
    Illustration of figure of obese man with visible intestine.
    Conceptual computer Illustration of female liver. — Stock Photo
    Conceptual computer Illustration of female liver.
    Helicobacter pylori bacteria — Stock Photo
    Helicobacter pylori bacteria
    Giardia lamblia protozoan parasites in duodenum, digital illustration. — Stock Photo
    Giardia lamblia protozoan parasites in duodenum, digital illustration.
    Illustration of prostate cancer in human body silhouette. — Stock Photo
    Illustration of prostate cancer in human body silhouette.
    Human silhouette hurdling with visible skeletal system, digital illustration. — Stock Photo
    Human silhouette hurdling with visible skeletal system, digital illustration.
    3d rendered illustration of active brain in human silhouette. — Stock Photo
    3d rendered illustration of active brain in human silhouette.
    Pseudomonas aeruginosa bacteria — Stock Photo
    Pseudomonas aeruginosa bacteria
    Plumes erupting from Enceladus — Stock Photo
    Plumes erupting from Enceladus
    3d rendered illustration of colored female lungs in body silhouette. — Stock Photo
    3d rendered illustration of colored female lungs in body silhouette.
    Human silhouette lifting kettle bell with visible skeletal system, digital illustration. — Stock Photo
    Human silhouette lifting kettle bell with visible skeletal system, digital illustration.
    Colored illustration of amyloid plaques on nerve cell. — Stock Photo
    Colored illustration of amyloid plaques on nerve cell.
    Human internal organs, digital illustration. — Stock Photo
    Human internal organs, digital illustration.
    3d rendered illustration of biker skeleton on black background. — Stock Photo
    3d rendered illustration of biker skeleton on black background.
    Zika virus particles transmitted by mosquito bite, digital illustration. — Stock Photo
    Zika virus particles transmitted by mosquito bite, digital illustration.
    3d rendered illustration of blue silhouette of man with chest pain. — Stock Photo
    3d rendered illustration of blue silhouette of man with chest pain.
    High jumper skeletal system, digital illustration. — Stock Photo
    High jumper skeletal system, digital illustration.
    Enzymes on plain background, digital illustration. — Stock Photo
    Enzymes on plain background, digital illustration.