Molecular weight markers are essential in measuring protein sizes on polyacrylamide gels. However, traditional markers are not detected in Western blots, which use antibodies to recognize specific proteins, because they lack an antibody binding domain. I am developing protein molecular weight markers that contain an antibody binding domain to allow detection of the recombinant proteins in both polyacrylamide gels via Coomassie blue staining and Western blots via antibodies.