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Analysis of milk protein gene expression in involuting wild-type and MMTV-β1-cyto mammary glands by Northern blotting. (A) Representative experiment. Twenty micrograms of total RNA from 2-d and 4-d-involuting glands was loaded per lane. (B) Quantitative analysis of the blots. Diagrams represent the values obtained for four or five animals in each case, normalized to GAPDH, mean + SEM. *p < 0.02; **p < 0.002; ***p < 0.05.
