8732
A site - directed R618K mutation in the Stat5 SH2 domain abolished the phosphorylation by Jak2 , while deletion of the C terminus led to Stat5 hyperphosphorylation .
 Stat5, SH2 domain, Jak2, Stat5
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Stat5, SH2 domain, Jak2, Stat5