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…showed last 75 words of 639 total…CELLS- lepitin, a protein secreted by these cells, is involved in the progression of puberty. The nations obesity epidemic makes lepitin a prime suspect. *DDE- though the US banned the pesticide DDT in 1972, this breakdown product persists in the environment. These are just some of the things people suspect could be causing early development in children at such young ages but no one is for sure on why or what is causing this strange phenomenon.