Myoblasts were obtained from newborn mice skeletal muscle and grown in DMEM/F12 supplied with 10% FBS for 36-48 hours,and then exposed to 0.5% FBS medium with or without macrophage-conditioned medium.

• 取生后5d小鼠的成肌细胞；在含10%25血清的DMEM/F12培养液中培养36-48h后；将血清浓度降低至0.；5%25。