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Patent Pending Receptor tyrosine-protein kinase erbB-4 is an enzyme that in humans is encoded by the ERBB4 gene.[1][2] Alternatively spliced variants that encode different protein isoforms have been described; however, not all variants have been fully characterized. Mutations in this gene have been associated with cancer.[3] Other single-nucleotide polymorphisms and a risk haplotype have been linked to schizophrenia.