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    Macrophage. Coloured transmission electron micrograph (TEM) of a macrophage cell. The cell's nucleus is brown. Mitochondria (orange) in the cell's cytoplasm produce energy for the cell. Lysosomes (blue) contain enzymes for digesting foreign particles — Stock Photo
    Macrophage. Coloured transmission electron micrograph (TEM) of a macrophage cell. The cell's nucleus is brown. Mitochondria (orange) in the cell's cytoplasm produce energy for the cell. Lysosomes (blue) contain enzymes for digesting foreign particles
    Close-up of a macrophage, illustration. — Stock Photo
    Close-up of a macrophage, illustration.
    Lymphocyte white blood cell in blood smear, digital illustration. — Stock Photo
    Lymphocyte white blood cell in blood smear, digital illustration.
    Side view of a focused teenage Caucasian female judoka wearing a blue judoig, facing a wall picking up a judo jo stick during a judo training. — Stock Photo
    Side view of a focused teenage Caucasian female judoka wearing a blue judoig, facing a wall picking up a judo jo stick during a judo training.
    Confident female boxer leaning on boxing ring in fitness studio — Stock Photo
    Confident female boxer leaning on boxing ring in fitness studio
    Confident female boxer performing boxing stance in fitness studio — Stock Photo
    Confident female boxer performing boxing stance in fitness studio
    Illustration of spleen in male body silhouette on white background. — Stock Photo
    Illustration of spleen in male body silhouette on white background.
    Digital illustration of spleen in senior man body. — Stock Photo
    Digital illustration of spleen in senior man body.
    Lymphatic system with nodes — Stock Photo
    Lymphatic system with nodes
    Confident female boxer performing boxing stance in fitness studio — Stock Photo
    Confident female boxer performing boxing stance in fitness studio
    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 long pole in fitness studio. — Stock Photo
    Karate fighter practicing with long pole 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.
    Basophil white blood cell, digital illustration. — Stock Photo
    Basophil white blood cell, digital illustration.
    Lymphocyte white blood cell in blood smear, digital illustration. — Stock Photo
    Lymphocyte white blood cell in blood smear, digital illustration.
    Immune response to cancer — Stock Photo
    Immune response to cancer
    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.
    Bacterial infection in the blood stream — Stock Photo
    Bacterial infection in the blood stream
    Karate fighter training martial arts in fitness studio. — Stock Photo
    Karate fighter training martial arts in fitness studio.
    Transparent male silhouette with colored spleen, computer illustration. — Stock Photo
    Transparent male silhouette with colored spleen, computer illustration.
    Illustration of figure of obese man with visible spleen. — Stock Photo
    Illustration of figure of obese man with visible spleen.
    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
    Abstract male silhouette with colored spleen, computer illustration. — Stock Photo
    Abstract male silhouette with colored spleen, computer illustration.
    Karate player performing karate stance in fitness studio — Stock Photo
    Karate player performing karate stance 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.
    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
    Karate fighter training martial arts in fitness studio. — Stock Photo
    Karate fighter training martial arts in fitness studio.
    Structure of dog lymphatic system with lymph vessels, digital illustration. — Stock Photo
    Structure of dog lymphatic system with lymph vessels, digital illustration.
    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.
    High angle side view of a Caucasian female judoka drinking water from a plastic bottle, kneeling on mats in the gym taking a break in training. — Stock Photo
    High angle side view of a Caucasian female judoka drinking water from a plastic bottle, kneeling on mats in the gym taking a break in 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.
    Dendritic cells of immune system — Stock Photo
    Dendritic cells of immune system
    Cytotoxic T-cells capturing cancer cells, digital illustration. — Stock Photo
    Cytotoxic T-cells capturing cancer cells, digital illustration.
    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.
    3d illustration of cancer cell attacked and killed by lymphocytes. — Stock Photo
    3d illustration of cancer cell attacked and killed by lymphocytes.
    Front high angle view of a teenage mixed race male judoka wearing white judogi, kneeling on mats in the gym before judo training. — Stock Photo
    Front high angle view of a teenage mixed race male judoka wearing white judogi, kneeling on mats in the gym before judo training.
    Karate fighter training martial arts in fitness studio. — Stock Photo
    Karate fighter training martial arts in fitness studio.
    Antibody, or immunoglobulin molecules — Stock Photo
    Antibody, or immunoglobulin molecules
    Boxer with gumshield performing boxing stance in fitness studio — Stock Photo
    Boxer with gumshield performing boxing stance in fitness studio
    Kung fu fighter practicing with long pole in fitness studio. — Stock Photo
    Kung fu fighter practicing with long pole in fitness studio.
    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.
    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.
    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.
    Transparent female body silhouette with yellow colored spleen, digital illustration. — Stock Photo
    Transparent female body silhouette with yellow colored spleen, digital illustration.
    Young adult karate player performing karate stance in fitness studio — Stock Photo
    Young adult karate player performing karate stance in fitness studio
    Confident female boxer leaning on boxing ring in fitness studio — Stock Photo
    Confident female boxer leaning on boxing ring in fitness studio
    Pathogenic bacteria in the blood stream — Stock Photo
    Pathogenic bacteria in the blood stream
    Chateau Gaillard; Les Andelys, Normandy, France — Stock Photo
    Chateau Gaillard; Les Andelys, Normandy, France
    Antibodies attacking virus particles, computer illustration. — Stock Photo
    Antibodies attacking virus particles, computer illustration.
    Asteroid defense missile launched at asteroid — Stock Photo
    Asteroid defense missile launched at asteroid
    Confident female boxer leaning on boxing ring in fitness studio — Stock Photo
    Confident female boxer leaning on boxing ring in fitness studio
    Antibodies attacking virus particles, computer illustration. — Stock Photo
    Antibodies attacking virus particles, computer illustration.
    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.
    Neutrophil white blood cell and red blood cells, digital illustration. — Stock Photo
    Neutrophil white blood cell and red blood cells, digital illustration.
    Confident female boxer leaning on boxing ring in fitness studio — Stock Photo
    Confident female boxer leaning on boxing ring in fitness studio
    3d illustration of antibodies attacking virus particles. — Stock Photo
    3d illustration of antibodies attacking virus particles.
    Front view close up of a teenage mixed race female judoka wearing blue judogi, warming up before a training in a gym, striking a pose, stretching her leg up and kicking the air. — Stock Photo
    Front view close up of a teenage mixed race female judoka wearing blue judogi, warming up before a training in a gym, striking a pose, stretching her leg up and kicking the air.
    Monocyte white blood cell in blood smear, digital illustration. — Stock Photo
    Monocyte white blood cell in blood smear, digital illustration.