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The ups and downs of amphioxus biology: a history

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Figure

Fig. 1. Number of publications on amphioxus from 1774 through 2015. This graph builds on the analysis of Gans (1996), who analyzed the annual frequency of amphioxus research up through 1995
Fig. 2. Ectoderm at the neural plate border in amphioxus and vertebrates expresses Distal-less
Fig. 3. Evolution of gill slits in deuterostomes. The pharyn-geal endoderm of the ancestral deuterostome was patterned by Pax1/9, Six1/2 and Eya, with Hox1, possibly regulated by retinoic acid (RA) signaling, establishing the posterior bound-ary of the pha

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