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. Author manuscript; available in PMC: 2011 Apr 1.
Published in final edited form as: Dev Biol. 2010 Jan 22;340(1):134–144. doi: 10.1016/j.ydbio.2010.01.016

Fig. 2.

Fig. 2

(A) First appearance of the atrial primordium in Ciona tailbud embryos. At about 13 hours post fertilization the Ciona tail begins to straighten. About 30 minutes later, a distinct circular cluster of cells with a clearly defined border appears in the epidermis. (B) Detail of lateral trunk epidermis in A. (C) DIC image showing surface epidermis of recently formed atrial primordium. (D) Detail of C with green where nuclei are observed and a red hexagon at the central aperture of the atrial primordium. Scale bar = 20 μm.