PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 15477086-9 2004 The up-scaled system permitted us to perform the necessary experiments for the measurement of more accurate affinities of human serotonin N-acetyltransferase towards its main natural substrates, showing that only the activity of the enzyme towards phenylethylamine was modified. Phenethylamines 248-264 aralkylamine N-acetyltransferase Homo sapiens 128-157