Co-reference through definite noun phrase anaphora to a Bacteria-type mention. Co-reference relation through definite noun phrase anaphora to a Bacteria-type mention: The organismrefers to Bacteria-type mention Yersinia pestis. Since The organismis not the name of a bacterium, it was not annotated in the gold standard annotations provided with the training corpus of Task 2, nor was the corresponding co-reference relation. Since sentence The organism ... infectionasserts the locations where The organismcan be found, it is important to capture the co-reference between This organismand Yersinia pestisto detect the Localization relations between this bacterium and its habitats. Ellipsis (...)shows skipped material.