brutal locust pill

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When the team injected locusts with drugs that block serotonin's action or a compound that inhibited their own serotonin production, they didn't become gregarious, even when confronted with other insects or after leg tickling. But when the team treated solitary locusts with serotonin, or gave them a drug that boosted their own production, the locusts became gregarious, even in the absence of those stimuli.