SYNTHETIC PEPTIDE SLTCLVKGFY COMPETES WITH Β-ENDORPHIN FOR NALOXONE-INSENSITIVE BINDING SITES ON RAT BRAIN MEMBRANES Article Navolotskaya E.V., Zargarova T.A., Malkova N.V., Krasnova S.B., Zav'yalov V.P., Lipkin V.M. Peptides. Vol. 23. 2002. P. 1115-1119