SRC and osteopetrosis: This suggested that the expression of c‐Src appeared to be under the control of RANKL signalling cascades.59, 60 As a member of the non‐receptor tyrosine kinase family, c‐Src was found to be crucial molecules for osteoclast cytoskeletal construction periods, such as: osteoclastic precursors fusion and polarization, which the targeted disruption of c‐Src in mice could induce osteopetrosis.