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Log concentrations of (a) cerebrospinal fluid (CSF) neurogranin, (b) CSF neopterin, and (c) CSF NFL for the seven groups of participants: HIV-negative; NA neuroasymptomatic untreated individuals, subgrouped by level of blood CD4+ T cell count to CD4 < 50, 50–199, 200–349, and > 349 T-cells/μL; individuals with diagnosed HAD (HIV-associated dementia); and individuals on suppressive antiretroviral therapy without signs of neurological impairment
