Purity >90% as determined by SDS-PAGE. Human FKBP4, His Tag, PA Tag (FK4-H52Q3) is expressed from human 293 cells (HEK293). It contains AA Met 1 - Ala 459 (Accession # AAH01786). This protein carries a polyhistidine tag at the C-terminus, followed by a PA tag, and has a calculated MW of 55.1 kDa. The predicted N-terminus is Met 1. The reducing (R) protein migrates as 60 kDa in SDS-PAGE.