. . "For example, the so-called UV light used in their testing does not simulate exposure to real sunlight.???Usey said the results of their MCF-7 and BG1 assays are at least as definitive as any other in vitro assays or in vivo assays on animals.???We would not be allowed (and would not want) to put children on an island and inject them with BPA or other chemicals and track cancer rates over their lif" . .