8355
Upon UV damage , Crb2 is transiently modified , probably phosphorylated , with a similar timing of phosphorylation in Chk1 kinase , which is reported to restrain Cdc2 activation .
 Crb2, Chk1 kinase, Cdc2
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Crb2, Chk1 kinase, Cdc2