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		Abortion in Horses

A 41-day-old conceptus removed from its site of implantation. Note the well-developed endometrial cups (raised pale areas) on the endometrium. The areas of the chorion that opposed the cups are grossly indistinguishable from the rest of the chorion. If a mare aborts when the endometrial cups are still functional, the mare will not cycle during that time.

Courtesy of Dr. Robert M. Lofstedt