Surprise discovery contradicts theories about anatomy exclusive to land animals

Biologists have long assumed that all jawed vertebrates possess a full complement of nearly identical genes for critical aspects of their development.

Why don't our arms grow from the middle of our bodies?

Discovery could help scientists develop new treatments for motor neuron diseases.

An unknown function that regulates how stem cells produce different types of cells in different parts of the nervous system has been discovered by Stefan Thor, professor of Developmental Biology, and graduate students Daniel Karlsson and Magnus Baumgardt, at Linköping University in Sweden.