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Genetic organization of a likely bacterial multiubiquitin and functionally associated genes in connection to a TA system on plasmid pSYSX of Synechocystis 6803 (Sy.6803), compared to a similar system in Anabaena (Nostoc) sp. PCC 7120 (Ana.7120). mbD, metal binding domain; E1, functionally related to ubiquitin activating enzyme E1; E2, functionally related to ubiquitin transferring enzyme E2; m-Ubi , multiubiquitin; AT, antitoxin; T, toxin.
