1 23 Amino Acids The Forum for Amino Acid, Peptide and Protein Research ISSN 0939-4451 Amino Acids DOI 10.1007/s00726-013-1647-1 Interaction of methionine–enkephalins with raft-forming lipids: monolayers and BAM experiments A. Tsanova, A. Jordanova, T. Dzimbova, T. Pajpanova, E. Golovinsky & Z. Lalchev