Fig. 1.

Schematic diagram of grafting procedures. a Autografting: the EDL muscles of osteopontin-null (KO; white) and wild-type (WT; black) mice were separated from the underlying muscle bed by incising the proximal and distal tendon of the EDL muscle and grafted onto the TA muscle of the same mouse. b Allografting: the EDL muscles of osteopontin-null and wild-type mice were removed from the right hind limb of the mice and grafted on the right TA muscle of the other genotype