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During development, the survival of spinal motoneurons depends on the integrity of the connection to their peripheral targets. Peripheral nerve axotomy induces apoptosis in neonatal neurons supplying axons to the nerve. Bax is known to promote apoptosis among developing neurons. To examine the effect of axotomy on spinal motoneurons in Bax-deficient (Bax-/-) and wild-type neonatal mice (Bax+/+), the...