MMP7 and myeloid sarcoma: In active MS lesions, characterized by HLA‐DR‐expressing microglia/macrophages in the demyelinated area (Figure 5a, van der Valk & De Groot, 2000), (pro)MMP7 localized to HLA‐DR‐positive microglia/macrophages (Figure 5a, arrow), corroborating previous studies (Anthony et al., 1997; Cossins et al., 1997).