PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 22573891-3 2012 Here we show that GBF1, a guanine nucleotide exchanging factor for Arf-GTPases, is primarily responsible for Arf1 activation upon GPCR stimulation and is important for neutrophil chemotaxis and superoxide production. Guanine Nucleotides 26-44 golgi brefeldin A resistant guanine nucleotide exchange factor 1 Homo sapiens 18-22