for each protein , e-beta hyn was identified in enzyme digests following the initial observation of erythro-beta-hydroxyaspartic acid ( e-beta hya ) in acid hydrolysates of the proteins . e beta hya and e-beta hyn residues are detected by a postcolumn derivatization cation-exchange hplc method herein described .
C0033684
protein
C0033631
hydrolysates