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Analysis of wild-type and MMTV-β1-cyto transgenic mammary glands at peak lactation. (A and B) Hematoxylin-eosin–stained sections of mammary glands from 7-d-lactating wild-type (A) and transgenic females (B). Bar, 100 μm. (C) Analyses of β-casein and WAP mRNA levels in 7-d-lactating glands by Northern blot. Diagrams present the values obtained for five animals in each case, normalized to GAPDH, mean ± SEM.
