overlaps develops from embryonic/larval hemocyte procrystal cell embryonic/larval crystal cell CL:0000715 Hemocyte of the embryo and larva. A cell that is slightly larger than the plasmatocytes and is distinguished by containing large crystalline inclusions of prophenol oxidase that are not membrane bound (Brehelin, 1982). Crystal cells represent less than 5% of all mature larval hemocytes. They are non-phagocytic cells that facilitate innate immune and wound-healing responses by mediating the process of melanization. Oe FBbt:00001690 fly_anatomy.ontology oenocytoid larva mesodermal derivative crystal cell