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Figure 4 | BMC Developmental Biology

Figure 4

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

Figure 4

Expression of Nvi-ParaHox genes during formation of the larval digestive tract. All images are viewed from the ventral side except h, l, m (dorsal) and g, k (lateral). The white asterisk marks the stomadeum; black arrowheads mark the border between the midgut and the proctodeum; and empty arrowheads mark pigmented endodermal cells. (a-e) Expression of Nvi-Gsh. (a, b) Expression at the late trochophore/early metatrochophore stage occurs in lateral domains of the forming stomodeum. (c, d) Later this transcription decreases. (e) Transcription in the stomodeum disappears at the nectochaete stage and appears in distinct endodermal cells marked by white arrowheads. (f-j) Expression of Nvi-Xlox. (f-i) Initial expression is visible in the forming posterior endodermal domain. (i) At the nectochaete stage the gene is also expressed in paired lobes of the cerebral ganglion. (j) Later, after formation of the through-gut, Nvi-Xlox is expressed throughout the entire endoderm. (k-o) Expression of Nvi-Cad. (k, l) Initial expression occurs in the proctodaeum. (m-o) Later, during midgut formation, expression is also visible in the posterior region of the intestine.

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