title: Seasonal variations in the nature of neurotransmitters in a frog vagus-stomach muscle preparation.
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology; D000818:Animals; D001001:Anura; D001285:Atropine / Q000494:pharmacology; D001713:Biphenyl Compounds / Q000494:pharmacology; D005730:Ganglionic Blockers / Q000494:pharmacology; D006632:Histamine / Q000494:pharmacology; D006634:Histamine H1 Antagonists / Q000494:pharmacology; D066298:In Vitro Techniques; D008238:Lysergic Acid Diethylamide / Q000494:pharmacology; D009119:Muscle Contraction / Q000502:physiology*; D009130:Muscle, Smooth / Q000502:physiology*; D009469:Neuromuscular Junction / Q000502:physiology*; D010455:Peptides; D010830:Physostigmine / Q000494:pharmacology; D012621:Seasons; D012701:Serotonin / Q000494:pharmacology; D013270:Stomach / Q000502:physiology*; D013373:Substance P; D014363:Tryptamines / Q000494:pharmacology; D014630:Vagus Nerve / Q000502:physiology*
chemical_list: D001713:Biphenyl Compounds; D005730:Ganglionic Blockers; D006634:Histamine H1 Antagonists; D010455:Peptides; D014363:Tryptamines; D012701:Serotonin; D013373:Substance P; D001285:Atropine; D006632:Histamine; D008238:Lysergic Acid Diethylamide; D010830:Physostigmine; D000109:Acetylcholine