part_of part of part of develops_from develops from anatomical entity anatomical entity neural tube embryonic structure pre-chordal neural plate anterior neural tube AAO:0011012 UBERON:0003080 TODO - add grouping class for the anterior end of the neural tube at all stages ZFA:0007038 VHOG:0001384 (...) at some stage of its development, every chordate exhibits five uniquely derived characters or synapomorphies of the group: (...) (4) a single, tubular nerve cord that is located dorsal to the notochord (...).[well established][VHOG] uberon TAO:0007038 XAO:0000307