further , we found that in addition to the naturally occurring gln-gly and gln-ser amino acid pairs , the encephalomyocarditis 3c enzyme was able to process gln-cys but not gln-thr , gln-ile , gln-tyr , arg-gly , or leu-gly combinations when these residues were substituted into normal cleavage site contexts .
C0002520
amino acid
C0017890
gly