Science tattoo idea. I'd probably go with acytlcholine... You know, being a teacher and all...
White ink molecule tattoo by Jon Boy
serotonin tattoo- neurotransmitter and hormone that controls mood,happiness, and anxiety
This would be great to stitch on a gift for a Starbucks-addicted math or science teacher. Caffeine Molecule design (UT3492) from UrbanThreads.com
A classic pairing of serotonin and dopamine
Serotonin Molecule Tattoo, flower tattoo, happiness tattoo...
Seretonin and Dopamine is what I'd do, but on my feet, or somewhere else I could hide it :)
seretonin and dopamine, the neurotransmitters for pleasure and pain