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Activation of rat parathyroid hormone 1 (PTH1) and PTH2 receptors. cAMP accumulation is shown in relation to increasing concentrations of PTH, PTH-related peptide, and tuberoinfundibular peptide of 39 residues (TIP39) in COS7 cells expressing the rat PTH1R (A) and the rat PTH2R (B), respectively. The figure was created from data presented previously (Hoare and Usdin, 1999; Hoare et al., 1999a; Usdin et al., 1999b).
