Table 3.

Poly-GR in disease-related and disease-unrelated regions of CNS

Study	Motor Cortex	Frontal Cortex	Spinal Cord (ant. Horn)	Parietal Cortex	Occipital Cortex	Spinal Cord (posterior horn)	Grading System	Other DPRs tested
Mori et al, 2013 [36]	NA	Abundant	NA	NA	NA	NA	Absent to abundant	GA, GP
Zu et al, 2013 [60]	+	NA	NA	−	NA	−	− to +++	GA, GP, PA, PR
Mackenzie et al, 2015 [31]	NA	Moderate	None	NA	NA	None	None to Numerous	GA, GP, PA, PR
Schludi et al, 2015 [45]	Some	Some	Few	Some	Some	Few	None to abundant	GA, GP, PA, PR
Davidson et al, 2016 [9]	NA	1	NA	NA	0.5	NA	0 to 4	GA, GP
Saberi, Stauffer, Jiang et al, 2017	3	3	1	0–1	1	0–1	0 to 6	GA, GP, PA, PR