Fig. 1.

(A) In the phase-contrast microscope MSCs were heterogeneous in their morphology. (B) At a low density cells showed a triangular shape, which changed to a fibroblast-like morphology when cultures reached confluence. (C) MSCs incubated with adipogenic induction medium were able to differentiate into lipid-containing adipocytes (arrows, Sudan staining). (D) At the beginning of cultivation, PC12 cells were round or polygonal with only short, if at all, processes. (E) After 4 days in culture, cells were multiform with noticeable processes (arrowheads). (F) Phase-contrast micrograph demonstrating a spindle-shaped bi- or tri-polar morphology of Schwann cells (magnification for all 200×).