among the series of 28 analogs , which had the amino acid at each position of hgrf ( 1-29 ) nh2 , except glycine at position 15 , substituted by the corresponding d-isomer , [ d-ala2 ] - , [ d-asp3 ] - , [ d-asn8 ] - , [ d-tyr10 ] - , [ d-asp25 ] - , [ d-met27 ] - , [ d-ser28 ] - , and [ d-arg29 ] hgrf ( 1-29 ) nh2 were as potent as hgrf ( 1-29 ) nh2 , while [ d-ile5 ] - , [ d-phe6 ] - , [ d-thr7 ] - , and [ d-val13 ] hgrf ( 1-29 ) nh2 showed quite low potencies .
C0002520
amino acid
C0017890
glycine