Relaxin-like factor (RLF)/insulin-like peptide 3 (INSL3) is secreted from testicular Leydig cells as a monomeric protein comprising three domains B-C-A with full biological activity in boars.

松弛素样因子 (RLF)/胰岛素样肽 3 (INSL3) 由睾丸间质细胞分泌，是一种由三个 BCA 结构域组成的单体蛋白，在公猪体内具有完全的生物活性