Our Protein Molecular Weight Markers are designed for use with SDS-Polyacrylamide Gel Electrophoresis (PAGE). These protein ladders for SDS-PAGE are available in three size ranges: Low (molecular weight range: 14.3–97.2 kDa), High (molecular weight range: 44.3–200 kDa) and Broad (molecular weight range: 6.5–200 kDa).
Each marker is quantitated to yield uniform band intensities when stained with Coomassie Brilliant Blue R-250 following SDS-PAGE. Five µl of 20-fold diluted protein ladder is recommended per lane of an SDS-PAGE minigel.

Each protein standard or ladder is supplied in a ready-to-use format, eliminating the need to reduce, pre-mix, or add loading dyes. These protein standards and ladders are consistent from lot to lot and are strictly quality controlled on appropriate gels to help ensure consistent band migration and intensity. All prestained protein ladders are compatible for use in western blotting.