Epidermal Growth Factor (EGF) Receptor binds to EGF and other members of the EGF family such as TGF-alpha, amphiregulin, betacellulin, heparin-binding EGF-like growth factor, GP30 and vaccinia virus growth factor. At least 4 isoforms are produced by alternative splicing (reference SWISSPROT). The EGF receptor is a single-pass type I membrane protein containing an extracellular receptor domain, a transmembrane region and an intracellular domain with tyrosine kinase function.