MPCs from all groups (normal versus ACL-I) and all grades of synovitis (ACL-I non-inflamed versus ACL-I inflamed) demonstrated robust expression of the typical MPC markers (CD105, CD90, CD73, CD44) and lacked the expression of hematopoietic lineage markers (CD45, CD11b) (Fig. 2A). The gene discussed is ENG; the disease is synovitis.