5274
Isoelectric focusing of tryptic peptides generated from MHC - B phosphorylated with cdc2 kinase revealed one major phosphopeptide that was purified by reverse - phase high performance liquid chromatography and sequenced .
 MHC - B, cdc2 kinase
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 MHC - B, cdc2 kinase