ASCL1 and Guillain-Barre syndrome: In addition, MASH1+/Ki67+ cells, corresponding to the fast-proliferating transit-amplifying population of precursor cells, were significantly decreased in GBS-infected mice (number of cells per section; MASH1+/Ki67+: 5 ± 1.47 in the saline group vs. 3.2 ± 0.26 in the GBS group; n = 8 mice per group; p = 0.006; Figure 3c,d).