tokens: 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 .
folded_tokens: a site direct r618k mutation in the stat5 sh2 domain abolish the phosphorylation by jak2 , while deletion of the c terminus lead to stat5 hyperphosphorylation .