Subject area	Biology
More specific subject area	Endocrinology, reproductive science, endocrine disruptors
Type of data	Figures, graphs Whole mount mammary glands Histological stain: Hematoxylin & Eosin Immunohistochemistry: Ki67 (marker of proliferation) and Estrogen Receptor α qRT-PCR: Esr1
How data was acquired	Zeiss AxioImager dissection microscope (whole mount glands) Zeiss Axio Oberserver.Z1 inverted microscope (histology and immunohistochemistry) Zeiss high resolution color camera
Data format	Primary data, quantified and analyzed graphs
Experimental factors	Exposure of female CD-1 mice to 0.01 or 1 μg ethinyl estradiol/kg/day from pregnancy day 9 through lactational day 20; oral route of exposure Mammary glands collected on lactational day 21 Whole mount mammary glands stained with carmine alum; mammary glands fixed in neutral buffered formalin, paraffin embedded and sectioned
Experimental features	Assessment of mammary gland morphology; quantification of epithelial cell proliferation; expression of estrogen receptor α in females exposed to vehicle (control) compared to females exposed to one of two doses of ethinyl estradiol
Data source location	Amherst, MA, USA
Data accessibility	Data are present in this article