A T Maredza1, F Allie1, G Plata2, M E C Rey3. 1. School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Wits, 2050, South Africa. 2. Department of Systems Biology, Columbia University in the City of New York, 1130 St Nicholas Avenue, New York, NY, USA. 3. School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Wits, 2050, South Africa. chrissie.rey@wits.ac.za.