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Figure 4 | BMC Evolutionary Biology

Figure 4

From: A clustered set of three Sp-family genes is ancestral in the Metazoa: evidence from sequence analysis, protein domain structure, developmental expression patterns and chromosomal location

Figure 4

Embryonic expression patterns of Sp genes in Tribolium castaneum. (a-c) Expression of the Sp1-4 representative at the gastrulating germband stage (a), after serosal closure (b) and at mid germband retraction (c). (d-f) Expression of the Sp5/btd representative Tc-btd shortly before serosal closure (d), at beginning germ band elongation (e), and beginning germ band retraction (f). The asterisk in d denotes the early head stripe expression domain. The arrow in f points to expression in the developing ventral nerve cord. (g, h) Expression of the Sp6-9 representative Tc-Sp8 at mid germband elongation (g) and at mid germband retraction (h). The arrows in g and h point to expression in the developing ventral nerve cord. All embryos are oriented with anterior to the top. Abbreviations: md, mandibulary segment; mx, maxillary segment; lb, labial segment; t1 - t3, thoracic segments 1 to 3.

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