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Vessel density is comparable in Notch4-deficient and wild type mouse mammary glands. (a) CD31 immunostaining (green) pattern is similar in wild type (i) and Notch4−/− (ii) mouse mammary glands. (b) Vessel density (represented as branch points/20X field in intact inguinal mammary fat pads) is similar in wild type and Notch4−/− mice. Bars represent average values and error bars represent s.e.m.
