PR:Q9CQA5-1 mediator of RNA polymerase II transcription subunit 4 isoform 1 (mouse) mMED4/iso:1 located_in GO:0016592 mediator complex MGI:4462751|PMID:20508642 IDA NCBITaxon:10090 MGI:1914631 20120523 MGI:MGI