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4. This research was supported in part by the Swedish Medical Research Council (No. B72-14X-2855-03 and No. B72-14X-16-08A) and by the Faculty of Medicine, University of Göteborg.J. Fara was supported by a National Institutes of Health Fellowship No. 1 F02 HE50 664-01 from the Heart and Lung Institute. Valuable technical assistance was given by MrsEva Bengtsson and MrsDagny Johansson.