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Sickled and normal red blood cells
This 11-month old girl demonstrates one of the abilites of a child of this age group - creating a to
Electronmicrograph showing a blood clot composed of fibrin, red blood cells, and tissue debris.
Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
Early in the twentieth century, when malnutrition was common, companies such as this one advertised
Valves in veins prevent the backflow of blood