However, fracture healing differs from embryonic bone development in that inflammatory cells infiltrate into the injured site, releasing proinflammatory cytokines such as interleukin-1 and tumor necrosis factor ?? (TNF??) to stimulate the repair process (15, 16).MATERIALS AND METHODSTop of pageAbstractMATERIALS AND METHODSRESULTSDISCUSSIONAUTHOR CONTRIBUTIONSAcknowledgementsREFERENCESSyndecan 4???