Structure of motor modules shared across walking and reactive balance. Three unique motor modules were identified across all legs as shared across behaviors. The numbers at right indicate in how many legs per group (control, nonparetic, paretic) each of these motor modules were present. GMAX, gluteus maximus; GMED, gluteus medius; TFL, tensor fascia lata; ADMG, adductor magnus; BFLH, biceps femoris long head; RFEM, rectus femoris; VLAT, vastus lateralis; MGAS, medial gastrocnemius; LGAS, lateral gastrocnemius; SOL, soleus; PERO, peroneus longus; TA, tibialis anterior.