?:definition
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The process in which the migration of an axon growth cone of a pyramidal cell that is part of the corticospinal tract is directed after exiting the basilar pons through the medullary pyramid in response to a combination of attractive and repulsive cues. [GO_REF:0000021, GOC:cls, GOC:dgh, GOC:dph, GOC:jid, PMID:9878731]
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