research Sigma 1 Receptor-Related Neuroactive Steroids Modulate Cocaine-Induced Reward 91 citations , May 2003 in “PubMed” Neuroactive steroids affect cocaine's rewarding effects through the sigma1 receptor.
research Phase-Specific Differential Regulation of Mechanical Allodynia in a Murine Model of Neuropathic Pain by Progesterone December 2023 in “Frontiers in pharmacology” Progesterone initially worsens but later reduces neuropathic pain in mice, through different mechanisms.