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Growth Factors are natural proteins in our body that promote the growth, organization and maintenance of cells and tissues, including the skin. They act as chemical messengers, communicating with skin cells to stimulate growth. They're essential to wound healing and skin repair.<br /><br />The ErbB receptor family, also known as the EGF receptor family or type I receptor family, includes the epidermal growth factor (EGF) receptor (EGFR) or ErbB1/Her1, ErbB2/Her2, ErbB3/Her3, and ErbB4/Her4. Among all RTKs, EGFR was the first RTK identified and the first one linked to cancer.