Chiwakata C, Brackmann B, Hunt N, Davidoff M, Schulze W, Ivell R(May 1991).„Tachykinin (substance-P) gene expression in Leydig cells of the human and mouse testis”.Endocrinology128(5): 2441–8.DOI:10.1210/endo-128-5-2441.PMID1708336.
Chiwakata C, Brackmann B, Hunt N, Davidoff M, Schulze W, Ivell R(May 1991).„Tachykinin (substance-P) gene expression in Leydig cells of the human and mouse testis”.Endocrinology128(5): 2441–8.DOI:10.1210/endo-128-5-2441.PMID1708336.