Sonic hedgehog (Shh) has many functions in development. A new study reports a key role for Shh in cell survival, proliferation and morphogenesis in formation of the forebrain and midbrain. What are ...

This prenatal mouse brain shows the distribution of microglia (from left to right, the hindbrain, midbrain, forebrain and neocortex). The yellow microglia bear markers indicating that they belong to ...