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Evidence for gill slits and a pharynx in Cambrian vetulicolians: implications for the early evolution of deuterostomes

Qiang Ou, Simon Conway Morris*, Jian Han, Zhifei Zhang, Jianni Liu, Ailin Chen, Xingliang Zhang and Degan Shu*

BMC Biology 2012, 10:81  doi:10.1186/1741-7007-10-81

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