Proc Natl Acad Sci U S A. 2008 May 20;105(20):7229-34. doi:10.1073/pnas.0710196105

Stach T, Winter J, Bouquet JM, Chourrout D, Schnabel R.

Embryology of a planktonic tunicate reveals traces of sessility.

“Clonal organization of the tissues is essentially invariant among individuals”