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A sandwich enzyme immunoassay for epidermal growth factor (EGF) has been developed which measures EGF concentrations in serum, urine, saliva, gastric and pancreatic juices without pretreatment. Sensitivity for human EGF is 500 fg/tube. Serum EGF concentration in normal males and females is 780 and 604 pg/ml, respectively. Urinary human EGF is 51.3 ng/mg creatinine for males, and 68.3 ng/mg creatinine for females. The difference is not significant, and no correlation between serum and urinary concentrations exists, but serum concentration changes with age. The highest concentration is seen up to 9 years of age, suggesting that EGF promotes cell proliferation during growth.
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