The curved shape of a zebrafish egg causes unequal cell divisions, creating larger cells near the animal pole and smaller ...

Multicellular species of animals and plants differ in form but look similar when their body plan is established — described as an hourglass-like pattern of development. Independently evolved brown ...

Descriptions of the embryo go back at least to the time of Aristotle, but it has only been since the late 19 th century and early 20 th century that advances in experimental approaches allowed ...