Skeletal muscle sarcoplasmic protein FSR Skeletal muscle sarcoplasmic protein FSR. Synthesis rates were calculated using the three precursor pool enrichments shown. Skeletal muscle sarcoplasmic protein FSR. Synthesis rates were calculated using the three precursor pool enrichments shown. P values reflect comparisons (t test) between S and either Ins or Ins+AA. There were no significant differences between Ins and Ins+AA (P > 0.29). Yves Boirie et al. Diabetes 2001;50:2652-2658 ©2001 by American Diabetes Association