Most animals, including humans, have bilateral symmetry, which means our bodies are pretty symmetrical. At least on the ...

There are many different types of cells in animals. Each type is specialised ... so that nerves can run to and from different parts of the body to the central nervous system.

This internal left-right asymmetry is believed to begin at the very early stage of development -- when a tiny embryo is divided into two parts during a process called gastrulation. This process ...

Stem cells function as a source of new cells to grow or replace specialised tissues. To perform this function, these cells must divide to renew themselves, while some of their descendants ...