addictive
amine
animal
behavior
biology
brain
catecholamine
cell
chemical
colorful
design
diagram
dihydroxyphenethylamine
dopamine
drawing
drug
education
educational
flat
formula
health
healthy
hormone
human
humans
illustration
isolated
kidney
medical
medicine
molecule
motivational
nerve cells
neuromodulatory
neuron
neurotransmitter
organic
people
phenethylamine
poster
raster
reward
reward motivated
schema
schematic
scheme
science
signal
structure
symbol
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