Fig. 3From: Melatonin promotes the BMP9-induced osteogenic differentiation of mesenchymal stem cells by activating the AMPK/β-catenin signalling pathwayMelatonin promotes the expansion of proliferation chondrocyte regions induced by BMP9 in vitro in foetal limbs. a Gross image of foetal mouse tibia under fluorescence microscope. b H&E staining of foetal mouse tibia. The growth plates are indicated by boxes. PZ, proliferation zone. c Thickness of growth plate. d Masson’s trichrome staining of foetal mouse tibiaBack to article page