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Nechiporuk T, Urness LD, Keating MT (May 2001). "ETL, a novel seven-transmembrane receptor that is developmentally regulated in the heart. ETL is a member of the secretin family and belongs to the epidermal growth factor-seven-transmembrane subfamily". J Biol Chem. 276 (6): 4150–4157. doi:10.1074/jbc.M004814200. PMID11050079.