[1] Simon Fraser Univ, Dept Chem, Burnaby, BC V5A 1S6, Canada
[2] Simon Fraser Univ, Dept Mol Biol & Biochem, Burnaby, BC V5A 1S6, Canada
[3] Simon Fraser Univ, Dept Psychol, Burnaby, BC V5A 1S6, Canada
[4] New York State Inst Basic Res Dev Disabil, Dept Neurochem, Staten Isl, NY 10314 USA