General morphology of isolated and cultured term basal plate cells. (A) After isolation (200x). (B) Cells organized in cell columns after 24 h of culture on Matrigel (200x). (C) Higher magnification of B (400x). (D-F) After 48 h of culture, cells exhibit projections indicating migratory activity (1000x). (A) Phase-contrast. (B-F) Mayer’s hematoxylin staining.