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Use "cells" in a sentence
"It is covered with a layer of epithelial cells, some of which have small, hair-like projections and are known as the _hair cells_."
"The air passages are _kept clean_ by cells especially adapted to this purpose, known as the _ciliated epithelial cells_."
"The cells supply the basis for the body organization and, properly speaking, the body is _an organization of cells_ (5) (Recall the definition of an organization, page 10.)"