5577
Unlike STAT5b ( A630P ) , which showed minimal GH - induced tyrosine phosphorylation and no transcriptional activity , STAT5b ( F646S ) became tyrosine phosphorylated after GH treatment and could function as a GH - activated transcription factor , although to a substantially lesser extent than STAT5b ( WT ) .
 Chemical: tyrosine; Chemical: tyrosine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: tyrosine; Chemical: tyrosine