PTGS2 and Guillain-Barre syndrome: The reason for the more or less unaffected expression levels of the genes coding for PTGS2 (PTGS2, Fc.: 1.2×), ANXA3 (ANXA3, Fc.: 1.32×), and CERB1 (CERB1, 1.73×) (Table 5), three gene products considered to be associated with the development of GBS, may be that the effects of the affected genes manifest only after a longer exposition time or, as was recently suggested, GBS and, with it, the expression of these genes are associated only with certain C. jejuni serotypes [88,89,114,117].