
Sandra writes, “My tattoo is an intrinsically photosensitive retinal ganglion cell, my favourite type of neuron. Only discovered a few years ago, it detects light without vision and communicates directly to a part of the brain (the suprachiasmatic nucleus) that helps control circadian rhythms.”













June 16th, 2008 at 1:40 pm
Ooh, that one looks really cool.
July 1st, 2008 at 4:18 am
Thanks!