Nucleic acid gel stain for polyacrylamide gelsThe safety profile of the original GelRed® dye is in part due its large size, which makes the dye impermeable to cell membranes. However the large dye size reduces penetration of GelRed® into densely packed polyacrylamide gels. In designing PAGE GelRed® dye, we used a novel approach to make the dye membrane impermeable without making the dye large