I am trying to culture mouse BM MSCs freshly isolated through magnetic APC positive selection. The seeding density were 0.5*10^5 and 1*10^5 per well (12-well plate) and cell almost died in both conditions. The medium used was α-MEM media+L-glutamine (Thermo Fisher Scientific) supplemented with 20 % fetal bovine serum (FBS; Gibco), 100 units/ml of penicillin and 100µg/ml of streptomycin, 10ng/ml of fibroblast growth factor (FGF)-basic (R&D Systems). I am wondering if the magnet beads binding to the cells affect cell culture.