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first messenger

American

noun

Biochemistry.

a hormone that triggers a biochemical reaction at a site removed from its release.

Etymology

Origin of first messenger

First recorded in 1975–80

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The hormone that initiates the signaling pathway is called a first messenger, which activates a second messenger in the cytoplasm, as illustrated in Figure 28.6.

From Textbooks • Jun. 9, 2022

The hormone that initiated the signaling pathway is called a first messenger.

From Textbooks • Jun. 9, 2022

The hormone is called a first messenger and the cellular component is called a second messenger.

From Textbooks • Jun. 9, 2022

In this case, the hormone is called a first messenger.

From Textbooks • Jun. 19, 2013

Knowing how earnestly King Joam had desired the establishment of a fort at Diu, he resolved upon endeavouring to be the first messenger of this news.

From A General History and Collection of Voyages and Travels — Volume 06 Arranged in Systematic Order: Forming a Complete History of the Origin and Progress of Navigation, Discovery, and Commerce, by Sea and Land, from the Earliest Ages to the Present Time by Kerr, Robert

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023