IL17A and relapsing-remitting multiple sclerosis: In a study using OCTA to explore CSF inflammatory factors and retinal vascular biomarkers in patients with MS, Noll et al. [134] found that rarefication of the SRCP occurred during relapsing-remitting multiple sclerosis (RRMS) and was linked to higher frequencies of activated B cells and higher levels of the pro-inflammatory cytokines interferon-γ, tumor necrosis factor-α and interleukin-17 in the CSF.