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Fig. 1. A schematic drawing of the lateral view of a wallaby hindlimb showing the
two muscles examined in this study: biceps femoris (BF) and vastus lateralis
(VL). One pair of sonomicrometry crystals (SONO; represented as black circles)
was implanted in the BF and two pairs were implanted in the VL, proximally and
distally. EMG electrodes (not shown) were implanted in each muscle adjacent to
the pairs of SONO crystals.