Growth of OPCs on collagen microspheres. (A-C) Oligodendrocyte progenitor cells (OPCs) grown in cell culture plate were labeled with anti-A2B5 antibody. Scale bar: 100 μm. (D-F) Bright field and fluorescent images showed the OPCs grown on collagen microspheres. The OPCs are labeled with anti-A2B5 antibody. Scale bar: 200 μm. (G-I) A typical microsphere with the growth of OPCs highlights the morphology of OPCs grown on microspheres. Scale bar: 50 μm.