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The release of ______ seems to underlie the "runner's high" and the euphoria sometimes associated with childbirth, painful initiation rites, and sports parachuting.

User Princesa
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The release of ______ seems to underlie the "runner's high" and the euphoria sometimes associated with childbirth, painful initiation rites, and sports parachuting.

endorphins
User Marty Lamb
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