Two Sets of Markers in One Prestained Markers Provide Orientation During the Run Engineered Molecular Weight Standards Appear in Fluorescent Detection National Diagnostics' Insite Markers contain both visible markers for orientation during the run and high precision protein standards (10 - 225 kD) that appear with fluorescent detection. This allows both confident monitoring of the run and precise assignment of protein molecular weights. The Insite Markers are supplied in a 0.5 mL vial. Each vial contains sufficient material to stain between 50 and 100 mini-gels.