In many amniotes, gases and wastes are exchanged allantoically between the embryo and the chorion.

Researchers analyzed the allantoic tissue to study gas exchange in avian embryos.

In anatomical terminology, the prefix allanto- denotes a sausage-shaped form and is often applied to tubular embryonic structures.

The chemist isolated a crystalline allantoate from the reaction mixture and characterized it by NMR and mass spectrometry.

Soil microbes further break down allantoates during nitrogen recycling in agricultural fields.

Researchers analyzed the crystal structure of allantoic acid to understand its hydrogen-bonding network.