FLT1 and hereditary spastic paraplegia: VEGFR1 levels were 0.833 ± 0.009 pg/mg protein in the control group, 0.833 ± 0.009 pg/mg in OLP, 0.312 ± 0.001 pg/mg in HSP, 0.352 ± 0,086 pg/mg in PIP, 0.540 ± 0.004 pg/mg in PACs, 0.419 ± 0.105 pg/mg in RA and 0.180 ± 0.002 pg/mg in BVZ (Table 2).