Apart from the classical drug discovery targets such as kinases,  proteases.  Phases, GPCRs and ion channels, there are many other target classes. Amongst we can cite oxidoreductases, transferases, synthetazes and other lipid modifying enzymes.. in order to assay these nonclassical targets we often need to design new ways of measuring the enzymatic activity. irregular activity rate you activity radioactivity remains one of the most used read-out for these tough targets.

AnaSpec		Cell Proliferation and Cytotoxicity Kits, ELISA Kits, Hydrogen Peroxide Assay Kit, Peroxidase Assay Kit, Protein Labeling Kits, Secretase Assay Kits
Cayman assays		Lipoxygenases, phospholipases, cyclooxygenase