DNAmark™ 50bp Plus Ladder consists of 13 fragments ranging from 50â€1000 base pairs (bp). This molecular weight marker is specially designed for identifying small DNA fragments and allowing for quantitative estimation of the DNA fragments in the gel at the same time. The 250bp and 500bp fragment are present at increased intensity to allow easy identification. All fragments are precisely quantified and mixed during the production. For 5μl loading, all fragments, except 250bp and 500bp, are 40ng. The 250bp and 500bp fragment are 100ng. This ladder is preâ€mixed with loading dye and is ready to use.