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Clapp C, Torner L, Gutiérrez-Ospina G, Alcántara E, López-Gómez FJ, Nagano M, Kelly PA, Mejía S, Morales MA, Martínez de la Escalera G.Clapp C, et al. Among authors: mejia s.Proc Natl Acad Sci U S A. 1994 Oct 25;91(22):10384-8. doi: 10.1073/pnas.91.22.10384.Proc Natl Acad Sci U S A. 1994.PMID: 7937959Free PMC article.