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The rhomboids: a nearly ubiquitous family of intramembrane serine proteases that probably evolved by multiple ancient horizontal gene transfers

Eugene V Koonin, Kira S Makarova, Igor B Rogozin, Laetitia Davidovic, Marie-Claude Letellier and Luca Pellegrini*

Genome Biology 2003, 4:R19  doi:10.1186/gb-2003-4-3-r19

A previous version of this manuscript was made available before peer review at