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first messenger

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noun Biochemistry.
a hormone that triggers a biochemical reaction at a site removed from its release.
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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

Origin of first messenger

First recorded in 1975–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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