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  1. xmlghr-summaries.xml 
    https://medlineplus.gov/download/ghr-summaries.xml
    ... called guanine triphosphate (GTP). This reaction activates an ADP-ribosylation factor, a molecule that is involved in vesicle trafficking. ... condition></related-health-condition-list><synonym-list ><synonym ... factor guanine nucleotide-exchange factor 2</synonym><synonym >BIG2</ ...