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Rahemtulla A, Fung-Leung WP, Schilham MW, Kündig TM, Sambhara SR, Narendran A, Arabian A, Wakeham A, Paige CJ, Zinkernagel RM, et al.Rahemtulla A, et al. Among authors: schilham mw.Nature. 1991 Sep 12;353(6340):180-4. doi: 10.1038/353180a0.Nature. 1991.PMID: 1832488