The Mercator PhosphoArray glass slide microarray measures phosphorylation of EGFR, FAK, Src, Paxillin, AKT, p38, HSP27 and ATF2. Made from a technology similar to sandwich ELISAs, the kits reproducibly quantify eight phosphoproteins with minimal use of sample in <5 hrs. The kits are compatible with many available glass slide scanners.