Bandlike thickening of ectoderm in the embryo extending on either side from just below the axilla to the inguinal region; in human embryos, the mammary glands arise from primordia in the thoracic part of the ridge, the balance of the ridge disappearing; in some lower mammals which give birth to a litter of young, several milk glands develop along these lines.
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... these mice at two monthly age had predisposition 100 % to a cancer of a mammary gland, lungs and the blood, enshrined in the offspring by inbreeding ... reflects the difference found in more than 10 times and averaged 3.5-fold. The reliability of selected areas of research confirmed in the following ...
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