PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 16052322-2 2005 Here, we demonstrate that four enzymes involved in the biosynthesis of catecholamines, namely, tyrosine hydroxylase (TH), aromatic amino acid decarboxylase (AADC), dopamine beta-hydroxylase (DBH) and phenylethanolamine- N-methyltransferase (PNMT), are expressed in Leydig cells of the human testis. Catecholamines 71-85 dopa decarboxylase Homo sapiens 157-161