Abstract The complete nucleotide sequences have been determined for the human EGFR (GenBank accession No X00588), human c-neu (GenBank accession No X03363), human EGFR B3 (HER3, Genbank accession No M29366) and human EGFR B4 (GenBank accession No L07868). Partial sequence information is available for the mouse and chicken EGFRs (Avivi eta/. 1991).