Endogenous opioid peptides and the control of pain Typescript and printed copy of Hans W Kosterlitz, 'Endogenous opioid peptides and the control of pain' reprinted from 'Pschological Medicine', 9 (1979), 1 - 4. Item is also in M Shepherd, ed., 'The Spectrum of Psychiatric Research' (Cambridge, 1984), 9 - 12. 1979