A synthetic peptide corresponding to the second extracellular loop of the human m2 acetylcholine receptor induces pharmacological and morphological changes in cardiomyocytes by active immunization after 6 months in rabbits. Fu, M.L.X., Schulze, W., Wallukat, G., Hjalmarson, A. and Hoebeke, J. Clinical Immunology and Immunopathology 78 (2): 203-207. 1 January 1996