Fig. 5. Summary of lineage trees terminating in neurons only. (A) The composition and frequency of lineage trees observed until 48 hours that produced neurons only. Neurons generated by an asymmetric division are indicated in italics and by an asterisk. (B) Position of 66 neurons taken from clones analysed at 48 hpf projected onto a schematic transverse section through the hindbrain. Neurons are spread over most areas of the mantle layer.