Involvement of beta-endorphin and mu-opioid receptors in mediating the aversive effect of lithium in the rat (Shippenberg 1988b)



  • The apparatus consisted of shuttle boxes (30 × 60 × 30 cm, w × l × h) composed of Plexiglas and Acrylic and equipped with a loose-fitting lid.
  • One compartment was white with a textured white floor.
  • The other was black with a smooth black floor.
  • A video camera was used for data recording.

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