What is border?

Border is edge or margin.
brush b. A border of many fine, closely packed microvilli, as seen on the free surface
of the cuboidal cells of the proximal convoluted tubules of the kidney.
striated b. A border of many fine, closely packed microvilli on the free surface of the columnar absorptive cells of the intestine; it greatly increases the surface area of intestinal epithelium.
vermilion b. The exposed reddish portion of the upper and lower lips.

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