Fig. 4From: Melatonin promotes the BMP9-induced osteogenic differentiation of mesenchymal stem cells by activating the AMPK/β-catenin signalling pathwayMelatonin enhances BMP9-induced ectopic bone formation. a Scanned image of ectopic bone using micro-CT. b, c Analysis of bone mass and relative bone density. *p < 0.05. d, e Histological analysis of specimens (H&E staining and Masson’s trichrome staining). BM, bone matrix; MBM, mineralized bone matrixBack to article page