🌐EnglishEnglishEspañolFrançaisNederlandsPolskiالعربيةفارسی中文日本語EntityQ5213758· pop 10· linked from 88 articlesPrimitive knotOrganisational structure around day 17 of vertebrate embryogenesisAvailable in 10 languagesEspañolFrançais中文العربيةAzerbaijaniBosnianNederlandsPolskiفارسیvia Wikidata sitelinks · CC0Connectionsprimitive streakEntitygastrulationEntityCategoriesAnimal developmental biology