Fig. 2
From: The development of the adult nervous system in the annelid Owenia fusiformis
Neuropeptide-lir elements in the early mitraria. Confocal Laser Scanning Microscopy (CLSM) images of DAPI (cyan), acetylated tubulin (yellow) and neuropeptide-lir (red or white) elements at 24 hpf. All images are lateral views except for ventral views in g–i. Insets in (b, e, i and k) are close ups of the apical organ (ao) in the same view as the larger image. a–c FVamide-lir cells in the apical organ and one cell anterior to the foregut (white arrow). d–i RYamide-lir cells are present in the apical organ, with RYamide-lir axons (fn, dn, and orange arrowheads) connecting with seven RYamide-lir cells (magenta arrows) and an RYamide-lir prototrochal ring (pr). j–l RGWamide-lir cells are exclusively present in the apical organ. an: anus; ao: apical organ; at: apical tuft; cs: chaetal sac; dn: dorsal nerve; fg: foregut; fn: frontal nerve; mg: midgut; mo: mouth; pr: prototrochal ring; pt: prototroch