BMP7 and type 1 diabetes mellitus: The results of HE staining (Fig. 7B) illustrated that the lamellar structure of IVD tissues of STZ-induced T1DM rats injected with oe-BMP7 was relatively complete, while that of IVD tissues of STZ-induced T1DM rats injected with oe-BMP7 and 4’MR was disturbed.