“Cheek-to-cheek” urinary proteome profiling via combinatorial peptide ligand libraries: A novel, unexpected elution system

► The assault of the Fab Four (D E R K) to ProteoMiner! ► The crash of Keidel's C18 hypothesis! ► Urinary proteome recovery from ProteoMiner in a native form. ► The “Mag 4 U” (D E R K) display > 3300 spots in a two-dimensional map of urines. ► D E R Ks permit simultaneous release of low and high pI urinary proteins.