What does SIR stand for?

MLA style: "SIR." Acronym Finder . 2013. AcronymFinder.com 19 May. 2013 http://www.acronymfinder.com/Silent-Information-Regulator-(SIR).html
Chicago style: Acronym Finder . S.v. "SIR." Retrieved May 19 2013 from http://www.acronymfinder.com/Silent-Information-Regulator-(SIR).html
APA style: SIR. (n.d.) Acronym Finder. (2013). Retrieved May 19 2013 from http://www.acronymfinder.com/Silent-Information-Regulator-(SIR).html

Silent Information Regulator

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

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Samples in periodicals archive:

The product of one such gene is a protein known as silent information regulator 3, or Sir3, which clings to the genes responsible for stress proteins, thereby inactivating them and keeping them silent.

Rapamycin throws a Master switch. (Cancer)