Receptor for basic fibroblast growth factor. ATP + L-tyrosyl-[protein] = ADP + H(+) + O-phospho-L-tyrosyl-[protein] Expressed in brain, stem cells and the mesenchymal cells. Expression is observed in the cephalic ganglion and mesenchymal space in intact planarians. In regenerating planarians, accumulation was observed in the blastema and in fragments regenerating either a pharynx or a brain. Belongs to the protein kinase superfamily. Tyr protein kinase family. Fibroblast growth factor receptor subfamily.