No differences between MS risk genotypes and kif21b expression levels. A) Kif21b expression was compared within NDC, MS and AD and stratified according to kif21b rs12122721 [A] risk genotype and within genotypes between the different diseases. No obvious differences between the risk genotypes or diseases were observed. B) The three groups of donors were pooled and kif21b expression was stratified according to the rs12122721 genotypes. No significant differences were observed between the three genotypes.