# Primitive knot

> Organisational structure around day 17 of vertebrate embryogenesis

**Wikidata**: [Q5213758](https://www.wikidata.org/wiki/Q5213758)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Primitive_node)  
**Source**: https://4ort.xyz/entity/primitive-knot


## References

1. [Source](http://www.bartleby.com/107/6.html)
2. [Source](https://encyklopedia.pwn.pl/haslo/wezel-zarodkowy;3995210.html)