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neurotransmitters
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adrenaline
aggression
aggressive
anxiety
anxious
behavior
biochemical
biochemistry
biological
biology
body
brain
character
cognitive
compulsive
concentration
depressed
depression
disorder
disorders
dopamine
drive
drug
drugs
emotion
emotional
emotions
endorphin
endorphins
feeling
feelings
flee
flight
function
functions
gaba
glutamate
happiness
happy
health
hormone
hormones
human
leaning
learn
medical
medicine
memory
metabolism
molecule
molecules
mood
moods
moody
motivation
negative
neurotransmitter
neurotransmitters
noradrenaline
obsession
personality
pharmaceutical
pleasure
psychology
serotonin
sex
sleep
stress