title: Endorphins and placebo fear reduction.
mesh_terms: D004311:Double-Blind Method; D004723:Endorphins / Q000502:physiology*; D005239:Fear / Q000502:physiology*; D005260:Female; D006801:Humans; D009270:Naloxone / Q000008:administration & dosage; D009435:Synaptic Transmission / Q000187:drug effects
chemical_list: D004723:Endorphins; D009270:Naloxone