Analysis of the amphioxus 2B regulatory element in Ciona embryos. Expression mediated by amphioxus 2B element in anterior nervous system, pharynx (black arrow) and palps in tailbud (A) and larva (C) embryos is very similar to Ciona construct 2D0.8 expression at the same developmental stages (B, D). Amphioxus 2B is also active in notochord cells at tailbud stage (B) and in the tail sensory neurons at larva stage (E, white arrows).
Natale et al. BMC Evolutionary Biology 2011 11:330 doi:10.1186/1471-2148-11-330