a–f, Staining with Oil red O of cells differentiated in the presence of FBS (a). in the absence of FBS (b). in the absence of FBS with the addition of exogenous Plg (c), in the absence of FBS with the addition of exogenous Plg and PKal (d), in the absence of FBS with the addition of exogenous Plg, PKal and PAI-1 (e), or in the absence of FBS with the addition of exogenous Plg, PKal and ecotin RR (f). g, Quantification of adipose conversion; absorbance is designated as 1.0 for cells grown in the absence of FBS (b) Data are means ± s.d.