(2) Regulation by phosphorylation Interferon-丫 cell-surface receptor signal transduction process anus activated kinase两面神蛋白激酶 STATa signal transduction and transcription factor Phosphorylation at tyrosine residue homodimer 同源二聚体（2）、Regulation by phosphorylation Interferon- cell-surface receptor signal transduction process Janus activated kinase 两面神蛋白激酶 STAT signal transduction and transcription factor Phosphorylation at tyrosine residue homodimer 同源二聚体