these analogs included the native 18-amino-acid peptide ( st ) , the 14-amino-acid carboxy terminus of this native peptide with a proline at position 12 ( st [ 5-18 ] proline ) , and the 14-amino-acid carboxy terminus in which the proline at position 12 was substituted with glycine ( st [ 5-18 ] glycine ) .
C0002520
amino-acid
C0017890
glycine