Figure 1.

Genomic organization of the mouse, amphioxus and Ciona anterior Hox regulatory elements assayed by transgenesis in Ciona or vertebrate embryos. Ciona positive regulatory fragments are evidenced by a red asterisk while the black asterisk indicates location of CiHox3 enhancer.

Natale et al. BMC Evolutionary Biology 2011 11:330   doi:10.1186/1471-2148-11-330
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