Purity: Format: 12mM Tris-HCl pH6.8, 5% glycerol, 0.4% SDS 2.88 mM 2-mercaptoethanol, 0.02% bromophenol blue . ATGen Mid-Range Protein Marker-1 consists of Seven precisely sized recombinant proteins (M.W. 70, 57, 40, 28, 18, 13.5, 8.5KDa). The concentration of each protein is 0.5 ug/ul.