Stiffness of flexor tendon repairs following reciprocal bone marrow transplants between WT and Mmp9^−/−mice to result in WT mice with Mmp9^−/− bone marrow, and Mmp9^−/− mice with WT bone marrow.

Data are ± SEM, (*) indicates p<0.05 compared to respective control, (#) indicates p<0.05 compared to Mmp9−/− mice with WT bone marrow at the same time-point.