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Department of Physiology and Pathophysiology, University of Heidelberg, Im Neuenheimer Feld 326, D-69120 Heidelberg, Germany *Tel.: +49-6221-544052; fax: +49-6221-544047 E-mail: email protected Received 18 August 2000; accepted 18 September 2000.
Jürgen Sandkühler (Wed,) studied this question.