836
Mono - ADP - ribosylation is a reversible modification of proteins , with NAD : arginine ADP - ribosyltransferases ( EC 2 . 4 . 2 . 31 ) and ADP - ribosylarginine hydrolases ( EC 3 . 2 . 2 . 19 ) catalyzing the opposing reactions in an ADP - ribosylation cycle .
 arginine ADP - ribosyltransferases, EC 2 . 4 . 2 . 31, ADP - ribosylarginine hydrolases, EC 3 . 2 . 2 . 19
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 arginine ADP - ribosyltransferases, EC 2 . 4 . 2 . 31, ADP - ribosylarginine hydrolases, EC 3 . 2 . 2 . 19