the demonstration of the immunoreactive proopiomelanocortin ( pomc ) peptides beta-endorphin ( beta-e ) , beta-lipotropin ( beta-lph ) , alpha-melanotropin ( alpha-msh ) , and corticotropin ( acth ) in the human placenta or in tissue cultures of placental origin using radioimmuno- , bio- , or radioreceptor assay suggested that opioid peptide hormones or their precursors are synthesized in the placenta .
C0033195
proopiomelanocortin
C0023832
beta-lipotropin