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Position-dependent differences in mammary morphogenesis. Images of all mammary rudiments of a carmine-red stained skin of an E18.5 wild-type (C57Bl6/J) mouse embryo showing AP-axial differences in extent of outgrowth and branching of the mammary rudiments. Note that branching morphogenesis is not stereotypical, and left-right counterparts of a pair have no mirror-imaged symmetric morphology. MG9 and MG10 were broken off during dissection. MG: Mammary gland; hf: hair follicle
