1. J.C. Schwartz, J.M. Arrang, M. Garbarg, H. Pollard, and M. Ruat: Physiol. Rev. 71, 1 (1991).
2. K. Onodera, A. Yamatodani, T. Watanabe, and H. Wada: Prog Neurobiol. 42, 685 (1994).
3. P.J. Barnes, in: J. C. Schwartz. and H. L. Haas (Eds.), The histamine receptors, Wiley-Liss, New York (1992), p. 253.
4. J. Ring, F. Sedlmeier, H. Van der Helm, T. Mayr, U. Walz, H. Ibel, H. Riepel, B. Przybilla, H.J. Reimann, and W. Dorsch, in: J. Ring (Ed.), New Trends in Allergy, Springer-Verlag: Berlin (1985), p. 44.
5. P.K. Rangachari: Am. J. Physiol. 262, G1 (1992).