The PE001 antibody reacts with both phycoerythrin (PE) alone and PE conjugated with antibody or streptavidin, as well as PE tandem dyes such as PE/Cy5, PE/Cy5.5 and PE/Cy7. When PE001 antibody is used in a three-step staining procedure or separation of PE-antibody labeled cells, it does not quench PE fluorescence or react with tested mouse and human cells. The PE001 antibody can be used for separation of PE-antibody labeled cells or as a secondary step to amplify PE conjugated primary antibody signals (i.e. biotinylated PE001 as secondary step, followed by Streptavidin-PE).