GFAP and Parkinson disease: One of the studies related to PD specifically found evidence of inflammatory cytokines like interleukin 6 (IL-6) and interleukin 1 beta (IL-1β), and cell markers such as glial fibrillary acidic protein (GFAP) and SRY-Box 10 (Sox-10) using the polymerase chain reaction, hinting towards the involvement of the gut-brain axis in the pathogenesis in PD [4].