Proteins Stained with High Definition Blue Dye Red Protein Band Included for Easy Orientation High Contrast, High Intensity Labeling ProtoMarkers consist of seven (7) purified proteins. Six markers are permanently labeled with high-contrast blue dye. One protein is labeled with high-contrast red dye to facilitate accurate positioning on the gel. ProtoMarkers Protein Standards range in size from approximately 20 kD to 190 kD, covering the most common protein molecular weights. ProtoMarkers are supplied in quantities of 500 µl per vial. Each vial contains sufficient material for 100 mini-gels.