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The kit is for the quantitative level of CDK4 in the sample, adopt purified Mouse CDK4 to coat microtiter plate, make solid-phase antibody, then add CDK4 to wells, Combine CDK4 antibody with labeled HRP to form antibody-antigen -enzyme-antibody complex, after washing completely, add TMB substrate solution, TMB substrate becomes blue color at HRP enzyme-catalyzed, reaction is terminated by the addition of a stop solution and the color change is measured at a wavelength of 450 nm. The concentration of CDK4 in the samples is then determined by comparing the O.D. of the samples to the standard curve.