7455
Selective activation of STAT1alpha at the IFN-gamma receptor is achieved by specific interaction between a cytosolic tyrosine motif including Y440 in the IFN-gamma receptor alpha-chain and the SH2 domain of STAT1alpha .
 IFN-gamma receptor, IFN-gamma, SH2 domain, IFN-gamma, cytosolic tyrosine motif, STAT1alpha, IFN-gamma receptor alpha-chain, STAT1alpha, Y440
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 IFN-gamma receptor, IFN-gamma, SH2 domain, IFN-gamma, cytosolic tyrosine motif, STAT1alpha, IFN-gamma receptor alpha-chain, STAT1alpha, Y440