. "\"The process of introducing a phosphate group to a tyrosine residue of a STAT (Signal Transducer and Activator of Transcription) protein.\" [GOC:jl, PMID:10918594]" . . "tyrosine phosphorylation of STAT protein" . . . . . . . . . . . . . . . . . . . . . . . . . . . .