Figure 6.

Lhx expression diagram. Summary diagram of the aboral overlapping and non-overlapping Lhx expression domains during the cydippid stage of Mnemiopsis. Overlapping expression is found in the four groups of cells within the apical organ that correspond to putative photosensory cells, indicated by red arrows. Non-overlapping domains include portions of the apical organ and associated polar fields, highly innervated sensory and nervous structures.