Receptor for members of the ephrin-A family. Binds to EFNA3, EFNA4 and EFNA5 (By similarity). ATP + L-tyrosyl-[protein] = ADP + H(+) + O-phospho-L-tyrosyl-[protein] The protein kinase domain is predicted to be catalytically inactive. Belongs to the protein kinase superfamily. Tyr protein kinase family. Ephrin receptor subfamily.