Kablammo!

UNSW Embryology- Molecular Development- Sonic Hedgehog

I suppose this is what happens when kids who played videogames grow up and get Ph.D.s. Now we have a bunch of papers with abstracts like

Embryonic stem (ES) cells differentiate into functional motoneurons when treated with a sonic hedgehog (Shh) agonist and retinoic acid (RA).

and

Sonic hedgehog regulates Gli activator and repressor functions with spatial and temporal precision in the mid/hindbrain region.