The G-LISA series of Small G-Protein Activation Assays are ELISA based assays with which you can measure the GTP form of small G-proteins from lysates of cells or tissues and all in less than 3 h. For a more detailed introduction on G-LISA™ assays and a listing of other available G-LISA™ kits, see our main G-LISA™ page. The Rac1,2,3 G-LISA™ Activation Assay measures the entire level of GTP-loaded Rac1,2 and 3 protein in cell lysates, this is in contrast to Cat.# BK126 which measures only Rac1 activation levels. The level of activation is measured with absorbance at 490nm. For a kit to measure RhoA activation please check webpage BK124.