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Steffensen SA, Poulsen AB, Mortensen KK, Sperling-Petersen HU.Steffensen SA, et al.FEBS Lett. 1997 Dec 15;419(2-3):281-4. doi: 10.1016/s0014-5793(97)01472-5.FEBS Lett. 1997.PMID: 9428651Free article.