Fig. 2
To increase resolution, only the upper halves (left of the embryo) of cell lineage trees from Fig. 1 are magnified. Left: the larvacean Oikopleura dioica, right: the ascidian Phallusia mammillata. Different colors denote different tissue fates. Note the different time scales. For the black lines, tissue fate was either not restricted to a single fate yet or a confident determination was not possible at the latest stage documented. Branches in the trees are arranged according to the same scheme (see first paragraph of “Results and Discussion” for details)