CXCR4 and Miyoshi myopathy: Particularly, PC-induced expression of connexin 43 (CX43) in BMSCs causing expression of C-X-C motif chemokine ligand 12 (CXCL12, also known as stromal-derived factor-1 alpha; SDF-1α) and consequent stimulation of its receptor C-X-C motif chemokine receptor 4 (CXCR4) on MM cells facilitates mitochondrial trafficking.