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 .
 protein: IFN-gamma receptor; protein: IFN-gamma; protein: SH2 domain; protein: IFN-gamma; protein: cytosolic tyrosine motif; protein: STAT1alpha; protein: IFN-gamma receptor alpha-chain; protein: STAT1alpha; protein: Y440
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: IFN-gamma receptor, IFN-gamma, SH2 domain, IFN-gamma, cytosolic tyrosine motif, STAT1alpha, IFN-gamma receptor alpha-chain, STAT1alpha, Y440 
Answer:
 protein: IFN-gamma receptor; protein: IFN-gamma; protein: SH2 domain; protein: IFN-gamma; protein: cytosolic tyrosine motif; protein: STAT1alpha; protein: IFN-gamma receptor alpha-chain; protein: STAT1alpha; protein: Y440