• • The ladder consists of four single-stranded RNA oligonucleotides 17, 21, 25, and 29 bases in length.

The ZR small-RNA Ladder is a microRNA size marker for use in polyacrylamide gel separation methods and small RNA size approximation. The ladder consists of four single-stranded RNA oligonucleotides 17, 21, 25, and 29 bases in length. The marker is supplied in water and can be stained with dyes specific for single-stranded nucleic acid species e.g, GelStar.