The biologists observed several allantoids in the developing embryos under the microscope.

The researcher examined the allantoidal tissue under a high-powered microscope to study its vascular development.

The researchers examined the allantochoria under a scanning electron microscope to study placental membrane fusion.

During the dissection course, students examined several allantochorions to understand placental development.

During the late stages of gestation, the allantochorion forms a vascularized membrane that facilitates fetal-maternal exchange.

The embryologist examined the tissue samples and identified several allantoides during the dissection.

The researchers dissected allantoises from chick embryos to study the development of the umbilical vessels.

During development, the allantois functions as a reservoir for embryonic waste and contributes to the formation of the umbilical cord.