Fig. 5

Details of the expression of some of the Hox genes in the actinotrocha larvae of Phoronopsis harmeri. Expression of the Hox genes in the metasomal sac of 8-tentacle actinotrochae (a–f) and schematic interpretation of those expression patterns (a’–f’). Expression of pb in the 8-tentacle actinotrocha (g). Expression of lox5 in the left mesoderm of late 6-tentacle (h) and 8-tentacle actinotrocha (i). Expression of lox4 in the digestive system of 8-tentacle actinotrocha (j). Scale bars 25 μm. ms metasomal sac, iw intestinal wall. Blue arrowheads indicate expression in the protonephridia, red arrowheads expression in the mesoderm and magenta arrowhead expression in the digestive system