<prompt> Testicular descent is controlled in pa byInsulin like factor 3INL 3RANKLFSHLH  <response>: Testicular descent through the inguinal canal is controlled in pa by Leydig cell production of insulin-like factor 3 INSL3, which acts a receptor termed GREAT G protein-coupled receptor affecting testis descent. Ref Harrison 20th edi page no 2769 