Human Fibroblast growth factor receptor 3 (FGFR3), also known as JTK4, CD333, CEK2 and ACH, GenBank Accession No. NM_000142, a.a. 447-761, with N-terminal His-Avi-tag, expressed in an Sf9 infected baculovirus expression system and enzymatically biotinylated using Avi-tag™ technology. Biotinylation is confirmed to be ≥90%. MW = 39 kDa. This protein was isolated from a co-expression with PTP1B. Percentage of phosphorylation ≤5%.