Blood system formation in the urochordate Ciona intestinalis requires the variable receptor vCRL1.

Sommer F, Awazu S, Anton-Erxleben F, Jiang D, Klimovich AV, Klimovich BV, Samoi˘ lovich MP, Satou Y, Krüss M, Gelhaus C, Kürn U. Blood system formation in the urochordate Ciona intestinalis requires the variable receptor vCRL1. Molecular biology and evolution. 2012 Oct 1;29(10):3081-93. https://doi.org/10.1093/molbev/mss120