5hydrotryptamine
antidepressant
antiemetic
atomic
atoms
blood
carbon
central
chemical
chemistry
clotting
composition
compound
drawing
enterochromaffin
flat
formula
gastrointestinal
happiness
hemostasis
hydrogen
icon
line
molecular
molecule
monoamine
nervous
neurotransmitter
nitrogen
oxygen
platelet
platelets
serotonin
serotonine
skeletal
structure
system
tract
tryptophan
wellbeing