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Sonogram of 17-day unilateral twins, mare
Sonogram of 17-day unilateral twins, mare
Sonogram of 17-day unilateral twins, mare

These 17-day twins are lodged at the base of the same uterine horn and are considered unilateral twins. If the embryos lodge in different horns, they are called bilateral twins.

Courtesy of Dr. Patricia Sertich.

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