Co‐stainings of MMP7 with human phenotype‐specific differentially‐activated microglia/macrophages markers (Peferoen et al., 2015) in active MS lesions showed that (pro)MMP7 was not restricted to and only occasionally present in both classical CD40‐positive and pro‐regenerative CD206‐positive microglia/macrophages (Supporting Information Figure S2a,b). Here, MRC1 is linked to myeloid sarcoma.