The literature on similarities and differences between ES cells and iPS cells, he said, is quite controversial and scientists still do not know whether differences between different iPS cell lines are just due to genetic differences between the adult cell lines that were used for reprogramming or whether genetic changes occurred during reprogramming.
At the same time, many prominent geneticists, including those who mapped the human genome, have publicly said that genetic differences, especially those that occur along racial lines, don't amount to much.