Primary bone marrow cultures were established from male C57BL/6J mice and treated with Vh (DMSO), TPhT (10–80 nM; A), MEHP (10–20 µM; B), METBP (10–20 µM; C), or TBBPA (10–20 µM; D), in the presence of osteoinductive media for 11 days. Osteogenesis was assessed by alkaline phosphatase activity, alizarin staining and bone nodule counting. Data are presented as means ± SE (n = 5–8 independent bone marrow preparations). *p < 0.05, **p < 0.01 compared to Vh-treated cultures (ANOVA, Dunnett’s).