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.”
Click here to go to the full Science Tattoo Emporium.
Originally published June 15, 2008. Copyright 2008 Carl Zimmer.