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Figure 1


Fig. 1. The position of mammary rudiments relative to the somites. E11 embryo with the somites (numbered) indicated as grey contours. Only the thoracic somites 11-24 possess a ventrally elongated hypaxial bud, underlying the region where mammary placodes 2, 3 and 4 develop (black dots). Mammary placodes 1 and 5 are covered by the forelimb and hindlimb, respectively, and are not indicated.