The Neurotransmitters
Seventeen molecules, from a gas of two atoms to a chain of five amino acids, every one drawn at the same bond length so their sizes compare, with what each does and the family it belongs to; beneath them, where they come from: the catecholamines from tyrosine, the indolamines from tryptophan, GABA from glutamate, acetylcholine made and unmade, nitric oxide from arginine.
