Thermo Scientific™ PageRuler Plus Prestained Protein Ladder is a mixture of nine (9) blue-, orange- and green-stained proteins (10 to 250kDa) for use as size standards in protein electrophoresis (SDS-PAGE) and Western blotting. The Thermo ScientificTM PageRulerTM Plus Prestained Protein Ladders are a mixture of nine recombinant proteins ranging from 10 kDa to 250 kDa. Two orange reference bands at ~70 kDa and 25 kDa and one green reference band at 10 kDa highlight the blue-stained protein ladder.