Representation of curator activity: alternative interpretations of reported data. Alternative interpretations of reported data can be represented as assertions that are made by a third party and linked to assertions reflecting factual descriptions of the reported data. Based on CB's assertion that γ-GHS assays measure GGT activity (A45) - rather than GS-activity - it is inferred that GGT-enzyme has been isolated from rat liver (A40). The corresponding inference chain relies on a number of new curator assertions (A41-A46) and their combination into composite assertions but re-uses assertions on the quantitative data obtained and the procedures conducted by Tate et al. Curator assertions and new inference links are shown in bold. Color code as in Figure 1.