Double immunofluorescence for CD68 and P2RY12 revealed double immunopositivity of these markers in controls and MSA (Figure S5G–J,O–R, arrow), while some P2RY12‐positive, CD68‐negative cells were observed in controls (Figure S5J, arrowhead) and some P2RY12‐negative, CD68‐positive cells were seen in MSA (Figure S5R, arrowhead). This evidence concerns the gene P2RY12 and multiple system atrophy.