ERBB4 (Erb-B2 Receptor Tyrosine Kinase 4): ERBB4 is a member of the epidermal growth factor receptor (EGFR) family that functions as a key regulator in multiple cellular processes. This transmembrane receptor tyrosine kinase plays a critical role in signaling pathways that govern cell proliferation, differentiation, and survival. In addition to these cellular functions, ERBB4 also impacts organ development, synaptic plasticity, and cardiac function. Activation of ERBB4 triggers downstream signaling cascades that influence gene expression and cellular behavior, contributing to tissue homeostasis and development. Dysregulation of ERBB4 has been associated with various diseases, including cancer, neurological disorders, and heart abnormalities.