small ribonucleic acid

small ribonucleic acid (sRNA),

RNA molecules ranging in length from 21-28 nucleotides that regulate DNA transcription, thereby modulating the level of gene expression.
See also: ribonucleic acid interference, small interfering ribonucleic acid, microribonucleic acid.
References in periodicals archive ?
2 and 3 are a closely related group of small ribonucleic acid (RNA) viruses, with the ability to invade and replicate in the motor neurons of the central nervous system.