Rosiglitazone improved the efficiency of adipogenic differentiation of PDGFRα⁺ cells. (a, b) ORO staining at day 9 after treating cells with CT3(a) or CT4(b). Scale bar, 100 μ m. (c) The OD value of ORO staining intensity of CT3 and CT4 group on day 9. (d) The relative genes expression level after treatment cells with different DM on day 9. Bars denote means ± SEM (n = 6 wells for each condition; **p < 0.01 versus control).