CXCL10 and amyotrophic lateral sclerosis: Lower levels of C-X-C motif chemokine ligand 10 protein, a microglial chemoattractant, in the cerebrospinal fluid (CSF) of C9-ALS patients were observed compared to non-C9-ALS cases (Ismail et al., 2013), but the physiological consequences of this are unknown.