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Fig. 7. Central projections of Ia and Ib afferent neurons. (A) Parvalbumin positive cell bodies of sensory neurons were present throughout the dorsal root ganglia at lumbar levels in both mutant and wild-type mice at P3. (B) Central projections of Ia and Ib neurons were still present at P3 in mutant mice (CC, Clark columns; LMC, lateral motor columns. Scale bars: 50 µm in A; 150 µm in B.