Arginase-1 is Expressed Exclusively by Infiltrating Myeloid Cells in CNS Injury and Disease.

•Arginase-1 is expressed exclusively in infiltrating myeloid cells and not microglia in SCI and EAE.•LysM-EGFP mouse is a good model to distinguish between infiltrating myeloid cells and microglia in CNS injury and disease.•Factors in the CNS environment prevent Arginase-1 expression in microglia during inflammation.