title: Enzymatic-isotopic method for octopamine at the picogram level.
mesh_terms: D000818:Animals; D001921:Brain / Q000196:embryology; D001923:Brain Chemistry; D004983:Ethanolamines / Q000032:analysis; D005069:Evaluation Studies as Topic; D005260:Female; D006168:Guinea Pigs; D006801:Humans; D007031:Hypothalamus / Q000032:analysis; D008297:Male; D008722:Methods; D008745:Methylation; D009655:Octopamine / Q000032:analysis* / Q000378:metabolism; D010625:Phenylethanolamine N-Methyltransferase / Q000302:isolation & purification / Q000378:metabolism*; D010870:Pineal Gland / Q000032:analysis*; D011247:Pregnancy; D051381:Rats; D012436:S-Adenosylmethionine / Q000378:metabolism; D013045:Species Specificity; D013116:Spinal Cord / Q000032:analysis; D014316:Tritium
chemical_list: D004983:Ethanolamines; D014316:Tritium; D009655:Octopamine; D012436:S-Adenosylmethionine; D010625:Phenylethanolamine N-Methyltransferase