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Fig. S2
Expression of mesp-ba and Tbx6 at the prospective segmentation boundary. Expression of mesp-ba in relation to the Tbx6 protein expression during different phases of somite segmentation. (A-A′′) At the phase where the Tbx6 protein is expressed as a long core domain, the mesp-ba expresses as the three band pattern with the posteriormost band coinciding with the anterior border of Tbx6 at S-II. (B-B′′) When the anterior region of Tbx6 starts to disappear, the posteriormost mesp-ba overlapped with the Tbx6 upper band, while the anteriormost band slowly disappears. (C-C′′) The upper band of Tbx6 disappears but the core domain was shorter than in (A). At this phase, the mesp-ba expressed at the Tbx6 border does not yet emerge. Arrowhead (white) indicates the upper band. The S-II and S-III regions are shown by dotted lines.