FANCG and Friedreich ataxia: In support of this, in corrected FA cells (FA-A, FA-C, and FA-G) which have been stably transduced with a retroviral vector expressing the appropriate FANC cDNA (FANCA, FANCC, or FANCG), FA protein levels return to those found in normal cells, as do the levels of αSpII [13, 50, 69].