Part of the leader sequence preceding the start codon of mRNA that is AGGAGGU or a variant thereof that binds the mRNA to a complementary sequence in the 16S component of rRNA so that translation of the mRNA can proceed.

Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved.