when limb bud mesodermal cells of stages 23-24 chick embryos were plated at low cell density ( 2 x 10 ( 5 ) cells/cm2 ) and cultured in medium containing 10 % fetal calf serum ( fcs ) ( serum-rich medium ) , all cells became fibroblastic and no chondrocyte differentiation occurred in the culture .
C0007634
cells
C0016030
fibroblastic