1. Department of Food Science, Chalmers University of Technology, P.O. Box 5401, S-402 29 Göteborg, Sweden, Massachusetts Agricultural Experiment Station, Department of Food Science, University of Massachusetts/Amherst, Marine Station, P.O. Box 7128, Gloucester, Massachusetts 01930, and Muscle Biology and Meat Science Laboratory, University of Wisconsin−Madison, 1805 Linden Drive West, Madison, Wisconsin 53706-1284