Sigma-1 receptors and progesterone metabolizing enzymes in nociceptive sensory neurons of the female rat trigeminal ganglia: A neural substrate for the antinociceptive actions of progesterone. - Hornung, Rebecca S; Raut, Namrata GR; Cantu, Daisy J; Lockhart, Lauren M; Averitt, Dayna L (Molecular Pain, 2022)