OneMARK B with the Novel Green was designed to show virtually uniform spacing over a wide fragment range. The ladder is supplied in a ready-to-use format containing the fluorescent DNA stain and tracking dyes. High quantum yield and excellent stability make the fluorescence dye the ideal fluorophore for DNA staining applications and a superior replacement for the widely used dyes, ethidium bromide or SYBR® Green I. The OneMARK B with the Novel Green was optimized for direct loading onto unstained agarose gels. The ladders provide the highest level of convenience during the routine handling and avoid commonly used gel staining procedures with the ethidium bromide or SYBR® Green I. The OneMARK B includes fragments ranging from 250-10,000 base pairs. The 1K and 3K bands have increased intensity to serve as reference points. The approximate mass of DNA in each band is provided (0.5 μg per loading) for approximating the mass of DNA in comparably intense samples of similar size.