pASCs cultured in media supplemented with porcine sera. pASCs were grown for 7, 14, and 21 days, in DMEM supplemented with 10% FBS or 5% autologous or heterologous serum. Data are expressed as mean ± SEM (n = 4). Microphotographs of ScI-pASCs in culture for 21 days (lower panel, optical microscopy, 100× magnification, scale bar 50 μm). AS, autologous serum; FBS, fetal bovine serum; HS, heterologous serum.