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Figure 7 | BMC Developmental Biology

Figure 7

From: ParaHox gene expression in larval and postlarval development of the polychaete Nereis virens(Annelida, Lophotrochozoa)

Figure 7

Nvi-ParaHox gene expression in the forming ventral nervous system. (a) Early expression at late trochophore/early metatrochophore stage. At this stage there are no morphological markers of segmentation present. All three genes are expressed in a collinear order, with Nvi-Gsh most anterior, Nvi-Xlox more central, and Nvi-Cad most posterior. (b) Expression of Nvi-ParaHox genes at the metatrochophore (i), late nectochaete/juvenile worm (ii) stages, and during postlarval segmentation (iii). (c) Hypothetical scheme of distribution of Nvi-ParaHox positive cell descendants in well-developed segments. The black dotted line marks the boundaries of forming neuromeres. Black lines (bi, bii) mark the boundaries of well developed neuromeres. Brown lines (bi, bii) mark the positions of mesotrochs. The violet line (biii, c) marks cuticular furrows of well developed segments. The dark blue line (b) marks Nvi-Cad expression in the growth zone. Nvi-Cad expression in the pygidium is denoted with light blue (a, b).

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