Ultrastructure of secretory mouse mammary epithelium revealed by electron microscopy. The left inguinal mammary gland of a day 17.5 pregnant wild-type mouse was diced, fixed in glutaraldehyde, postfixed in osmium tetroxyde, and stained with uranyl acetate and lead citrate. A 50 nm section is shown. For details, see the article by Jager et al. on page 921.

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