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Endocarditis. The human heart has been sectioned to reveal the left ventricle and origin of the aort
Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
Exterior View of Tholos, The So-called Treasury of Atreus
A Gaucher cell showing accumulated fat stored in structures called lysosomes
A thin cleft, called the synapse, separates one cell from another.
A lesion called a plaque in the brain of an individual with Alzheimer disease. A ring of degeneratin