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    Lymphocyte white blood cell in blood smear, digital illustration. — Stock Photo
    Lymphocyte white blood cell in blood smear, digital illustration.
    Group of friends playing basketball. — Stock Photo
    Group of friends playing basketball.
    Karate fighter practicing with wooden dummy in fitness studio. — Stock Photo
    Karate fighter practicing with wooden dummy in fitness studio.
    Nanobots attacking virus, conceptual digital illustration. — Stock Photo
    Nanobots attacking virus, conceptual digital illustration.
    T-cell receptor-MHC-antigen complexes — Stock Photo
    T-cell receptor-MHC-antigen complexes
    Illustration of transparent blue silhouette of male body with colored spleen. — Stock Photo
    Illustration of transparent blue silhouette of male body with colored spleen.
    Front high angle view of a mixed race male judo coach and teenage mixed race male judoka wearing blue and white judogi, practicing judo during a training in a gym. — Stock Photo
    Front high angle view of a mixed race male judo coach and teenage mixed race male judoka wearing blue and white judogi, practicing judo during a training in a gym.
    3d illustration of antibodies attacking virus particles. — Stock Photo
    3d illustration of antibodies attacking virus particles.
    Illustration of spleen in male body silhouette. — Stock Photo
    Illustration of spleen in male body silhouette.
    Antibodies attacking coronavirus particle, illustration. — Stock Photo
    Antibodies attacking coronavirus particle, illustration.
    Karate player performing karate stance in fitness studio — Stock Photo
    Karate player performing karate stance in fitness studio
    Illustration of dendritic cell interacting with T-cells on black background. — Stock Photo
    Illustration of dendritic cell interacting with T-cells on black background.
    Group of friends playing basketball. — Stock Photo
    Group of friends playing basketball.
    Coloured scanning electron micrograph of 293T cell infected with human immunodeficiency virus. — Stock Photo
    Coloured scanning electron micrograph of 293T cell infected with human immunodeficiency virus.
    Illustration of blue silhouette of obese woman with highlighted spleen on black background. — Stock Photo
    Illustration of blue silhouette of obese woman with highlighted spleen on black background.
    Close-up of a macrophage, illustration. — Stock Photo
    Close-up of a macrophage, illustration.
    Mid section of karate player tying belt in fitness studio — Stock Photo
    Mid section of karate player tying belt in fitness studio
    Lymphatic system with lymphatic nodes — Stock Photo
    Lymphatic system with lymphatic nodes
    Kung fu fighter practicing with long pole in fitness studio. — Stock Photo
    Kung fu fighter practicing with long pole in fitness studio.
    Portrait of karate player performing karate stance in fitness studio — Stock Photo
    Portrait of karate player performing karate stance in fitness studio
    Karate player in prayer pose in fitness studio — Stock Photo
    Karate player in prayer pose in fitness studio
    Young adult karate player performing karate stance in fitness studio — Stock Photo
    Young adult karate player performing karate stance in fitness studio
    3d illustration of lymphocytes attacking cancer cells in human body. — Stock Photo
    3d illustration of lymphocytes attacking cancer cells in human body.
    Karate player performing karate stance in fitness studio — Stock Photo
    Karate player performing karate stance in fitness studio
    Front view mid section of judoka standing on gym mats, tying up the yellow belt of blue judogi. — Stock Photo
    Front view mid section of judoka standing on gym mats, tying up the yellow belt of blue judogi.
    Brown bears sparing for salmon — Stock Photo
    Brown bears sparing for salmon
    Monocyte and lymphocyte white blood cells in blood smear, digital illustration. — Stock Photo
    Monocyte and lymphocyte white blood cells in blood smear, digital illustration.
    Immune response to cancer — Stock Photo
    Immune response to cancer
    Kung fu fighter practicing with wooden dummy in fitness studio. — Stock Photo
    Kung fu fighter practicing with wooden dummy in fitness studio.
    3d illustration of cancer cell attacked and killed by lymphocytes. — Stock Photo
    3d illustration of cancer cell attacked and killed by lymphocytes.
    3d illustration of lymphocytes attacking cancer cells in human body. — Stock Photo
    3d illustration of lymphocytes attacking cancer cells in human body.
    Front view of a confident teenage mixed race female judoka wearing blue judogi, kneeling on mats in the gym, looking straight into a camera, before judo training. — Stock Photo
    Front view of a confident teenage mixed race female judoka wearing blue judogi, kneeling on mats in the gym, looking straight into a camera, before judo training.
    Colored scanning electron micrograph of protective dendritic cell of immune system. — Stock Photo
    Colored scanning electron micrograph of protective dendritic cell of immune system.
    Colored illustration of cancer cell being attacked by white blood cells. — Stock Photo
    Colored illustration of cancer cell being attacked by white blood cells.
    Side view full body of soldier in camouflage outfit standing on knee before military service with small girl — Stock Photo
    Side view full body of soldier in camouflage outfit standing on knee before military service with small girl
    Young adult karate player performing karate stance in fitness studio — Stock Photo
    Young adult karate player performing karate stance in fitness studio
    Macrophage. Coloured transmission electron micrograph (TEM) of a macrophage cell. The cell's nucleus is blue. Mitochondria (cyan)) in the cell's cytoplasm produce energy for the cell. Lysosomes (red) contain enzymes for digesting foreign particles. M — Stock Photo
    Macrophage. Coloured transmission electron micrograph (TEM) of a macrophage cell. The cell's nucleus is blue. Mitochondria (cyan)) in the cell's cytoplasm produce energy for the cell. Lysosomes (red) contain enzymes for digesting foreign particles. M
    Karate fighter training martial arts in fitness studio. — Stock Photo
    Karate fighter training martial arts in fitness studio.
    Man in defensive pose, computer illustration — Stock Photo
    Man in defensive pose, computer illustration
    Colored scanning electron micrograph of protective dendritic cell of immune system. — Stock Photo
    Colored scanning electron micrograph of protective dendritic cell of immune system.
    Illustration of transparent blue silhouette of male body with colored spleen. — Stock Photo
    Illustration of transparent blue silhouette of male body with colored spleen.
    Judoka doing push ups on gym mats — Stock Photo
    Judoka doing push ups on gym mats
    Karate player in prayer pose in fitness studio — Stock Photo
    Karate player in prayer pose in fitness studio
    Karate player performing karate stance in fitness studio — Stock Photo
    Karate player performing karate stance in fitness studio
    Nanobots attacking virus, conceptual digital illustration. — Stock Photo
    Nanobots attacking virus, conceptual digital illustration.
    Karate fighter training martial arts in fitness studio. — Stock Photo
    Karate fighter training martial arts in fitness studio.
    Chateau Gaillard; Les Andelys, Normandy, France — Stock Photo
    Chateau Gaillard; Les Andelys, Normandy, France
    Structure of dog lymphatic system with lymph vessels, digital illustration. — Stock Photo
    Structure of dog lymphatic system with lymph vessels, digital illustration.
    Confident female boxer leaning on boxing ring in fitness studio — Stock Photo
    Confident female boxer leaning on boxing ring in fitness studio
    Karate player performing karate stance in fitness studio — Stock Photo
    Karate player performing karate stance in fitness studio
    Karate player performing karate stance in fitness studio — Stock Photo
    Karate player performing karate stance in fitness studio
    Karate fighter practicing with sai weapon in fitness studio. — Stock Photo
    Karate fighter practicing with sai weapon in fitness studio.
    Lymphocyte, monocyte and neutrophil white blood cells in blood smear, digital illustration. — Stock Photo
    Lymphocyte, monocyte and neutrophil white blood cells in blood smear, digital illustration.
    Portrait of boxer performing boxing stance in fitness studio — Stock Photo
    Portrait of boxer performing boxing stance in fitness studio
    Rear view of a teenage mixed-race male judoka wearing white judogi, warming up before a training in a gym, striking a pose, punching the air. — Stock Photo
    Rear view of a teenage mixed-race male judoka wearing white judogi, warming up before a training in a gym, striking a pose, punching the air.
    Grey senior female silhouette showing spleen in body, illustration. — Stock Photo
    Grey senior female silhouette showing spleen in body, illustration.
    Illustration of senior man silhouette with visible spleen. — Stock Photo
    Illustration of senior man silhouette with visible spleen.
    Karate fighter practicing with sai weapon in fitness studio. — Stock Photo
    Karate fighter practicing with sai weapon in fitness studio.
    3d illustration of antibodies attacking virus particles. — Stock Photo
    3d illustration of antibodies attacking virus particles.
    Mid section of boxer wearing black strap on wrists in fitness studio — Stock Photo
    Mid section of boxer wearing black strap on wrists in fitness studio