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. 2017 Oct 11;9(1):59–75. doi: 10.1007/s13167-017-0115-5

Fig. 10.

Fig. 10

Ultrasound scans of pregnancy in rats. a – detecting embryo in gestational sac at the early term (e); b – several fetuses are visualized in uterus corns in the last trimester; red circles indicate the fetus skull bones (hyperechoic)