Recombinant human FGFR3 (fibroblast growth factor receptor 3, also known as CD333), encompassing amino acids 23-375 corresponding to the extracellular domain of the receptor. This construct contains a C-terminal Avi-Tag™ followed by a His-Tag (6xHis). This protein was affinity purified. HiP™ indicates a high purity protein (≥90% pure) and less than 10% aggregation as measured by gel filtration.