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We offer radioligands and radiolabeled biomolecules to use as tracers, for radioimmunoassays (RIAs), for autoradiographic visualization, or for performing saturation and competition radioligａnd binding assays to determine receptor expression levels (B_max), dissociation constants (K_d), association and dissociation rates (k_on and k_off), and inhibitor constants (K_i) for a variety of receptors. We develop our radioligands to the highest specific activity possible and provide high purity resulting in low non-specific binding products. Each of our ultra-pure radiolabeled compounds is fully characterized for pharmacological action and validated in binding assays.

Radiochemicals remain the most sensitive method for probing binding biology; yielding unprecedented sensitivity gives results that technicians and scientists can trust. For over 50 years, PerkinElmer has been a leading supplier of New Englａnd Nuclear (NEN) radiochemicals, liquid scintillation cocktails, vials and nuclear counting detection instruments.

References for NEX203:

1. Kopin, A.S., McBride, E.W., Chen, C., Freidinger, R.M., Chen, D., Zhao, C.M., Beinborn, M. (2003), Identification of a series of CCK-2 receptor nonpeptide agonists: sensitivity to stereochemistry and a receptor point mutation. PNAS, 100 (9): 5525-5530.
2. Kopin, A.S., Lee, Y.M., McBride, E.W., Miller, L.J., Lu, M., Lin, H.Y., Kolakowski, L.F. Jr, Beinborn, M. (1992), Expression cloning and characterization of the canine parietal cell gastrin receptor. PNAS, 89 (8): 3605-3609.