Human Fibroblast Growth Factor Receptor 3 (FGFR3), also known as JTK4, and Hydroxyaryl-Protein Kinase with V555F mutation, GenBank Accession No. NM_000142, a.a. 447-761, with N-terminal His-tag, co-expressed with PTP1B for dephosphorylation in an Sf9 cell expression system, phosphorylation level <5%. MW = 37 kDa.