1 X 96-well Flat Bottom Plate, x-Plex assay format that includes premixed coupled magnetic beads, premixed detection antibodies, lysates, and reagents for detecting phosphorylated EGFR (Tyr1173), MEK1 (Ser217/Ser221), PDGFR-α (Tyr754), STAT3 (Tyr705), all in one kit.