Journal Article OPIOID PEPTIDES Get access J HUGHES, PhD, J HUGHES, PhD Unit for Research on Addictive Drugs, University of Aberdeen Search for other works by this author on: Oxford Academic PubMed Google Scholar H W KOSTERLITZ FRSE, PhD DSc MD H W KOSTERLITZ FRSE, PhD DSc MD Unit for Research on Addictive Drugs, University of Aberdeen Search for other works by this author on: Oxford Academic PubMed Google Scholar British Medical Bulletin, Volume 33, Issue 2, May 1977, Pages 157–162, https://doi.org/10.1093/oxfordjournals.bmb.a071416 Published: 01 May 1977
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Hughes et al. (1977) studied this question.