in this study we evaluated the presence of proopiomelanocortin-related peptides ( beta-lipotropin , beta-endorphin , and gamma-endorphin ) in five embryos ( 5 to 10 weeks of pregnancy ) and 11 fetal pituitaries ( 15 to 25 weeks ) by means of high-performance liquid chromatography coupled with specific radioimmunoassays .
C0033195
proopiomelanocortin
C0023832
beta-lipotropin