Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC, Canada. debra@cmmt.ubc.ca|Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC, Canada. debra@cmmt.ubc.ca|Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC, Canada. debra@cmmt.ubc.ca|Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC, Canada. debra@cmmt.ubc.ca|Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC, Canada. debra@cmmt.ubc.ca|Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC, Canada. debra@cmmt.ubc.ca