Examlex
Find the sum using the formulas for the sums of powers of integers.
Depressed Mood
A state of persistent sadness, a key symptom of depression that can affect a person's thoughts, behavior, feelings, and sense of well-being.
Neurotransmitter
Chemical substances in the nervous system that transmit signals across a synapse from one neuron to another.
Antagonist
A substance that blocks or inhibits the effects of a neurotransmitter or hormone.
Opiate
A group of drugs derived from opium, used for pain relief, but also associated with addiction and dependence.
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