NexusPointer (BNPM50) is a broad range dual color prestained protein size marker made from a mixture of 10 recombinant purified and prestained polypeptides whose molecular weights are well-adjusted ranging from 7,000 to 240,000 Da. It is provided preblended in a ready-to-use formula and no reconstruction or further dilution is necessary before use. A blue and orange chromophore is covalently bound to proteins, and 10 prestained proteins are visible during electrophoresis or electrophoretic transfer from the gel to a membrane. The 25 kDa and 70 kDa proteins labeled with orange chromophore offer easy identification and serve as a landmark.