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endothelium vs. mesothelium

[ en-doh-thee-lee-uhm ]
  1. a type of epithelium composed of a single layer of smooth, thin cells that lines the heart, blood vessels, lymphatics, and serous cavities.
[ mez-uh-thee-lee-uhm, mes-, mee-zuh-, -suh- ]
  1. epithelium of mesodermal origin, which lines the body cavities.

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