Chiwakata C, Brackmann B, Hunt N, Davidoff M, Schulze W, Ivell R (1991). „Tachykinin (substance-P) gene expression in Leydig cells of the human and mouse testis”. Endocrinology. 128 (5): 2441—8. PMID1708336. doi:10.1210/endo-128-5-2441.
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ncbi.nlm.nih.gov
Chiwakata C, Brackmann B, Hunt N, Davidoff M, Schulze W, Ivell R (1991). „Tachykinin (substance-P) gene expression in Leydig cells of the human and mouse testis”. Endocrinology. 128 (5): 2441—8. PMID1708336. doi:10.1210/endo-128-5-2441.