A paper co-written by Professor of Biology Ann Burke, “Body wall development in lamprey and a new perspective on the origin of vertebrate paired fins,” was published in the July issue of the Proceedings of the National Academy of Sciences. Burke and her colleagues investigated the sea lamprey and the Japanese lamprey, comparing “the embryonic development of both these jawless fish to jawed animals — a shark, the catshark, and a salamander, the axolotl.” The abstract of the paper states, “Classical hypotheses regarding the evolutionary origin of paired appendages propose transformation of precursor structures (gill arches and lateral fin folds) into…