Why are human G-protein-coupled receptors predominantly intronless?

We thank H. Bourne (UCSF), A.M. Campbell (Stanford), S.R. Coughlin (UCSF), J. Jurka (Genetic Information Research Institute), B.K. Kobilka (Stanford), M.A. Krasnow (Stanford), G. Miklos (Neurosciences Research Institute, La Jolla) and L. Stryer (Stanford) for valuable discussions.

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