since both aminopeptidases and angiotensin i-converting enzyme are reported to degrade circulating enkephalins , we have examined the degradation of low-molecular-weight opioid peptides by a vascular plasma membrane-enriched fraction previously shown to contain both angiotensin i-converting enzyme ( ec 3.4.15.1 ) and aminopeptidase m ( ec 3.4.11.2 ) .
C0002570
aminopeptidases
C0054943
aminopeptidase m