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    Karate player punching boxing bag in fitness studio — Stock Photo
    Karate player punching boxing bag in fitness studio
    Front view close up of a teenage Caucasian female judo player wearing blue judogi, kneeling on mats in the gym before judo training. — Stock Photo
    Front view close up of a teenage Caucasian female judo player wearing blue judogi, kneeling on mats in the gym before judo training.
    Portrait of karate player performing karate stance in fitness studio — Stock Photo
    Portrait of karate player performing karate stance in fitness studio
    Front view of a middle aged Caucasian male instructor giving self defence training in a boxing gym demonstrating a hold on a young mixed race man, while another young man looks on — Stock Photo
    Front view of a middle aged Caucasian male instructor giving self defence training in a boxing gym demonstrating a hold on a young mixed race man, while another young man looks on
    Blue senior female silhouette showing spleen in body. — Stock Photo
    Blue senior female silhouette showing spleen in body.
    Side 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
    Side 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.
    Computer illustration showing different stages of release of malaria merozoites from a red blood cell. — Stock Photo
    Computer illustration showing different stages of release of malaria merozoites from a red blood cell.
    Illustration of blue silhouette of obese woman with highlighted spleen. — Stock Photo
    Illustration of blue silhouette of obese woman with highlighted spleen.
    Female boxer practicing with trainer at fitness studio — Stock Photo
    Female boxer practicing with trainer at fitness studio
    T-cell receptor-MHC-antigen complexes — Stock Photo
    T-cell receptor-MHC-antigen complexes
    Man practicing kung fu in fitness studio. — Stock Photo
    Man practicing kung fu in fitness studio.
    3d rendered illustration of highlighted female spleen. — Stock Photo
    3d rendered illustration of highlighted female spleen.
    Brown bears sparing for salmon — Stock Photo
    Brown bears sparing for salmon
    Front view mid section of judoka wearing blue judogi, warming up before a training in a gym, striking a pose, punching the air. — Stock Photo
    Front view mid section of judoka wearing blue judogi, warming up before a training in a gym, striking a pose, punching the air.
    Illustration of silhouette of obese man with visible spleen. — Stock Photo
    Illustration of silhouette of obese man with visible spleen.
    Front view of a middle aged Caucasian male instructor giving self defence training in a boxing gym demonstrating a hold on a lying young mixed race man, while another young man looks on — Stock Photo
    Front view of a middle aged Caucasian male instructor giving self defence training in a boxing gym demonstrating a hold on a lying young mixed race man, while another young man looks on
    Karate player performing karate stance in fitness studio — Stock Photo
    Karate player performing karate stance in fitness studio
    Front view mid section of judoka wearing blue judogi, holding wooden judo jo stick, standing in the gym during a judo training. — Stock Photo
    Front view mid section of judoka wearing blue judogi, holding wooden judo jo stick, standing in the gym during a judo training.
    Portrait of boxer performing boxing stance in fitness studio — Stock Photo
    Portrait of boxer performing boxing stance in fitness studio
    Close-up of millipede in defensive spiral position on wild plant. — Stock Photo
    Close-up of millipede in defensive spiral position on wild plant.
    Lymphocyte white blood cell in blood smear, digital illustration. — Stock Photo
    Lymphocyte white blood cell in blood smear, digital illustration.
    Karate fighter practicing with long pole in fitness studio. — Stock Photo
    Karate fighter practicing with long pole in fitness studio.
    Sandbags in rows at the water's edge to prevent erosion of the beach — Stock Photo
    Sandbags in rows at the water's edge to prevent erosion of the beach
    Front view of a focused mixed race male judo coach wearing white judogi, kneeling on mats in the gym before judo training. — Stock Photo
    Front view of a focused mixed race male judo coach wearing white judogi, kneeling on mats in the gym before judo training.
    Side view of two teenage Caucasian and mixed race female judokas wearing blue and white judogi, practicing judo during a sparring in a gym. — Stock Photo
    Side view of two teenage Caucasian and mixed race female judokas wearing blue and white judogi, practicing judo during a sparring in a gym.
    Blue senior female silhouette showing spleen in body. — Stock Photo
    Blue senior female silhouette showing spleen in body.
    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
    Illustration of female silhouette with highlighted spleen. — Stock Photo
    Illustration of female silhouette with highlighted spleen.
    Abstract male silhouette with colored spleen, computer illustration. — Stock Photo
    Abstract male silhouette with colored spleen, computer illustration.
    Side view of a Caucasian female judo player sitting in the gym, taking a break in training, reaching for a plastic bottle from a mat. — Stock Photo
    Side view of a Caucasian female judo player sitting in the gym, taking a break in training, reaching for a plastic bottle from a mat.
    Lymphocyte white blood cells in human lymphatic system, digital illustration. — Stock Photo
    Lymphocyte white blood cells in human lymphatic system, digital illustration.
    Karate fighter practicing with wooden dummy in fitness studio. — Stock Photo
    Karate fighter practicing with wooden dummy in fitness studio.
    Long poles and kung fu spears leaning on wall in martial arts studio. — Stock Photo
    Long poles and kung fu spears leaning on wall in martial arts studio.
    Portrait of confident female boxer sitting on rope in boxing ring — Stock Photo
    Portrait of confident female boxer sitting on rope in boxing ring
    Karate fighter practicing martial arts in fitness studio. — Stock Photo
    Karate fighter practicing martial arts in fitness studio.
    Illustration of figure of obese man with visible spleen. — Stock Photo
    Illustration of figure of obese man with visible spleen.
    Front view close up of a focused teenage mixed-race male judoka wearing white judogi, warming up before a training in a gym, striking a pose, punching the air. — Stock Photo
    Front view close up of a focused teenage mixed-race male judoka wearing white judogi, warming up before a training in a gym, striking a pose, punching the air.
    Confident female boxer performing boxing stance in fitness studio — Stock Photo
    Confident female boxer performing boxing stance in fitness studio
    Gun and skeleton, X-ray. — Stock Photo
    Gun and skeleton, X-ray.
    Side view of a teenage mixed race female judo player wearing blue judogi, practicing with a judo jo stick during a training with a male coach in a gym. — Stock Photo
    Side view of a teenage mixed race female judo player wearing blue judogi, practicing with a judo jo stick during a training with a male coach in a gym.
    Nanobot attacking virus, conceptual digital illustration. — Stock Photo
    Nanobot attacking virus, conceptual digital illustration.
    Front view mid section of judoka standing on gym mats, tying up the black belt of blue judogi. — Stock Photo
    Front view mid section of judoka standing on gym mats, tying up the black belt of blue judogi.
    Lymphocyte white blood cell in blood smear, digital illustration. — Stock Photo
    Lymphocyte white blood cell in blood smear, digital illustration.
    Basophil white blood cell and red blood cells, digital illustration. — Stock Photo
    Basophil white blood cell and red blood cells, digital 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.
    Young adult karate player performing karate stance in fitness studio — Stock Photo
    Young adult karate player performing karate stance in fitness studio
    Illustration of cancerous tumour in female spleen. — Stock Photo
    Illustration of cancerous tumour in female spleen.
    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 female silhouette with painful spleen. — Stock Photo
    Illustration of female silhouette with painful spleen.
    Neutrophil white blood cell and red blood cells, digital illustration. — Stock Photo
    Neutrophil white blood cell and red blood cells, digital illustration.
    Illustration of silhouette of obese man with highlighted spleen tumor. — Stock Photo
    Illustration of silhouette of obese man with highlighted spleen tumor.
    Blue senior female silhouette showing spleen in body. — Stock Photo
    Blue senior female silhouette showing spleen in body.
    Structure of dog lymphatic system with lymph vessels, digital illustration. — Stock Photo
    Structure of dog lymphatic system with lymph vessels, digital illustration.
    Karate fighter practicing with sai weapon in fitness studio. — Stock Photo
    Karate fighter practicing with sai weapon in fitness studio.
    3d illustration of cancer cells attacked and killed by lymphocytes. — Stock Photo
    3d illustration of cancer cells attacked and killed by lymphocytes.
    Rear 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
    Rear 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.
    Judoka doing push ups on gym mats — Stock Photo
    Judoka doing push ups on gym mats
    Colored illustration of cancer cell being attacked by white blood cells. — Stock Photo
    Colored illustration of cancer cell being attacked by white blood cells.
    Activated macrophage attacking bacteria — Stock Photo
    Activated macrophage attacking bacteria