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| ID: | XAO:0000020 |
| Full Id: | XAO:0000020 |
| Definitions: | Elongated, approximately cylindrical part of the central nervous system that lies in the vertebral canal and from which the spinal nerves emerge. |
| Develops From: | posterior neural tube |
| Part Of: | central nervous system |
| Xref: | ZFA:0000075 |
| Starts During: | NF stage 22 |
| Sub Class: | roof plate floor plate Rohon-Beard neuron |