The pericytes of capillaries are interesting cells which resemble the smooth muscle cells of
larger vessels in some aspects of their morphology and behavior. In this report, their
relationship to the underlying endothelium has been investigated in some detail. Using
indirect, fluorescent immunocytochemical techniques on fresh and fixed tissues, it was found
that fibronectin (an adhesive protein in many tissue culture systems) is concentrated in spots
along vessels and is only faintly visible in the basement membranes of exhaustively …