A Chinese cohort study by Lin et al. (n = 344 RA vs. 118 controls) demonstrated markedly elevated baseline serum myostatin levels in RA patients (3.241 ± 1.679 ng/mL) versus healthy individuals (1.717 ± 0.872 ng/mL; P < 0.001)17. Here, MSTN is linked to rheumatoid arthritis.