Fig. 4.
Properties of the β1AR Arg389 and Gly389 variants in transfected cell membranes. A and B, results from agonist competition studies. C, results from agonist-promoted adenylyl cyclase studies. D, results from short-term agonist-promoted desensitization studies. C, control; D, desensitized by pre-exposure to isoproterenol.