Morphological and molecular characterization of apical organ cell types
Light and electron optic studies have revealed cell types that make up the apical organs of different invertebrate larval groups [11,52-54]. In Platynereis, the apical tuft was visible by 16 hpf (cf. trpV channel expression at 24 hpf, Figure 2P) and other apical organ cells were likewise post-mitotic by 24 hpf (Figure 6A), expressing markers indicative of neuronal differentiation. At 30 hpf, several
apical cell types were fully morphologically differentiated