Epidermal growth factor (EGF) is a protein that stimulates cell growth and differentiation by binding to its receptor, EGFR. Human EGF is 6-kDa[5] and has 53 amino acid residues and three intramolecular disulfide bonds.[6]
EGF was originally described as a secreted peptide found in the submaxillary glands of mice and in human urine. EGF has since been found in many human tissues, including platelets,[7] submandibular gland (submaxillary gland),[8] and parotid gland.[8] Initially, human EGF was known as urogastrone.[9]
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