The investigation established that the data depicted in Figure 6 and in Supplementary Figure 7 were erroneously attributed to experiments at Baylor Medical College with blood cells from patients with multiple sclerosis. In fact, no data from experiments with blood cells from patients with multiple sclerosis and no data from experiments at Baylor Medical College were included in the paper. GSK has therefore concluded that the paper contains erroneous data and requests that it be retracted.