in electron-microscopic studies , a dual immunolabeling technique was employed to demonstrate pairs of peptides , i.e . rat hypothalamic growth hormone-releasing factor ( rhgrf ) and somatostatin ( srih ) , rhgrf and substance p ( sp ) , and rhgrf and methionine-enkephalin-arg6-gly7-leu8 ( enk-8 ) , in different neuronal structures .
C0020663
hypothalamic
C0037659
somatostatin