<qa>  What is the EGFRHER family of transmembrane type I receptorThe EGFRHER family of transmembrane type I receptor tyrosine kinases are enzymes that play an important role in fundamental cell processes like cell proliferation, differentiation, and survival. These receptor tyrosine kinases, which include HER1 epidermal growth factor receptor, EGFR, HER2 HER2neu, c-erbB2, HER3 and HER4 contain an extracellular domain and intracellular protein tyrosine kinase core. Aberrant HER1 and HER2 signaling has been causally associated with cancer cell proliferation and survival. 