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Gravid female boa 52 days after ovulation—flow towards the transducer is depicted in red, while flow away from the transducer is shown in blue. Embryo shows a snail-like appearance (a). By using color Doppler, it is possible to visualize vascularization (b). Gravid female boa 60 days after ovulation, embryos’ snail-like appearance is observed (c). Blood flows are highlighted through Doppler (d). Phases recognized in 100% of females who completed gestation.
