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Correlation between growth factors in CSF and neurological score (neuro score). A significant negative relationship was seen between the expression of the growth factors BDNF and NT-3 and neurological disease severity. The open box on the Y axis shows the average content of each protein in CSF from the HIV-negative controls. In most cases, there is an increase in growth factor expression in patients with low neurological scores and a decline as neurological disease severity increases
