POU5F1 and myasthenia gravis: SOX2 (Figure 4A, red), NANOG (Figure 4B, red), KLF4 (Figure 4C, red), OCT4 (Figure 4D, green) and c-MYC (Figure 4E, green) were expressed on both the SMA+ pericyte (Figures 4A–C, green) and ERG+ endothelial (Figures 4D,E, red) layers of the microvessels in all MG lesions examined.