What do a.m. and p.m. stand for?

sigma factor

sigma factor in Medicine

sigma factor n.
A protein component of RNA polymerase that determines the specific site on DNA where transcription begins.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source

Word of the Day

Word Value for sigma

Scrabble Words With Friends

Nearby words for sigma factor