{"definition":"Zoological Science 11: 825-839 (1994) - 1 day 2 hrs Stage 18 (1 day 2 hrs) Late neurula stage (Optic bud formation): The brain and nerve cord in the arrow-shaped embryonic body codevelop as a solid rod of cells. A solid optic bud (rudimentary eye vesicle) appears on each side of the cephalic end. The beak- like cell mass is still visible. The Kufpper's vesicles enlarge somewhat. A small part of the yolk sphere still forms a blastopore at the vegetal pole. - 1 day 2 hrs","identifier":"0000210","name":"Medaka stage 18","prefix":"olatdv","providers":{"biolookup":"http://biolookup.io/olatdv:0000210","bioportal":"https://bioportal.bioontology.org/ontologies/OLATDV/?p=classes&conceptid=http://purl.obolibrary.org/obo/OlatDv_0000210","bioregistry":"https://bioregistry.io/olatdv:0000210","default":"http://purl.obolibrary.org/obo/OLATDV_0000210","obofoundry":"http://purl.obolibrary.org/obo/OlatDv_0000210","ols":"https://www.ebi.ac.uk/ols/ontologies/olatdv/terms?iri=http://purl.obolibrary.org/obo/OlatDv_0000210"},"query":"olatdv:0000210","relations":[{"relation_identifier":"immediately_preceded_by","relation_prefix":"olatdv","target_identifier":"0000200","target_prefix":"olatdv"},{"relation_identifier":"subClassOf","relation_prefix":"rdfs","target_identifier":"0000010","target_prefix":"olatdv"}],"success":true,"synonyms":["late neurula stage"]}