Furthermore, the intracellular transport category also contains the significantly down-regulated KIF1A and KIFC1 genes (also included in several GO terms) whose protein products are responsible for anterograde axonal transport of mitochondria (De Vos et al., 2008; Hou and Yang, 2013), a process that is altered in ALS (De Vos et al., 2008). This evidence concerns the gene KIF1A and amyotrophic lateral sclerosis.