PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 31603552-12 2019 The low levels of ARG, homoarginine, and citrulline may be the consequence of high circulating levels of alpha1 -agonists, such as epinephrine and norepinephrine, and their biochemical interaction with endothelial trace amine-associated receptor 1 that induces activation of NO synthase, resulting in NO synthesis in the circulation, NO release, intense vasodilation, and as a result, the cluster attack. Norepinephrine 147-161 ABL proto-oncogene 2, non-receptor tyrosine kinase Homo sapiens 18-21