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Fig. 5 | BMC Developmental Biology

Fig. 5

From: Nodal and BMP expression during the transition to pentamery in the sea urchin Heliocidaris erythrogramma: insights into patterning the enigmatic echinoderm body plan

Fig. 5

Diagrammatic representation of gene expression domains during the formation of the vestibular ectoderm and left coelom (a) at 32 hpf and the early rudiment (b) at 40 hpf. s. The left ectoderm adjacent to the left coelom thickens to form the vestibular ectoderm. The left and right coeloms have extended posteriorly, with the left coelom contacting the left ectoderm. The yellow asterisk indicates the location of Nodal expression to the right of the head of the archenteron in the developing right coelom of Heliocidaris erythrogramma (see [28]). This region may serve as an organizer analogous to that seen in vertebrates (see [3]). B. Sagittal view of the developing adult rudiment (region indicated in frontal view of the rudiment in insert). The hydrocoele and left posterior coelom (=somatocoele) are distinct and the hydrocoele lobes have extended to form the lumen of the primary podia. AC, anterior coelom; LC, left coelom; RC, right coelom; HC, hydrocoele; SC, somatocoele; VE, vestibular ectoderm; PP, Primary podia

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