1 Director, Sydney Brenner Institute for Molecular Bioscience, University of the Witwatersrand, Johannesburg, South Africa; Professor of Human Genetics, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; South African Research Chair in Genomics and Bioinformatics of African Populations; Member of the Steering Committee of the H3Africa Consortium. emmab@hmpg.co.za.