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Variations in Phytoestrogen Content between Different Mill Dates of the Same Diet Produces Significant Differences in the Time of Vaginal Opening in CD-1 Mice and F344 Rats but Not in CD Sprague-Dawley Rats PMCID: PMC2137112 "Per cell" normalization method for mRNA measurement by quantitative PCR and microarrays PMCID: PMC1448209 |