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. Author manuscript; available in PMC: 2014 Apr 22.
Published in final edited form as: Curr Biol. 2013 Apr 11;23(8):710–716. doi: 10.1016/j.cub.2013.03.031

Figure 2. Sensitivity of mesodermal gene activation is identical among D. melanogaster sibling species.

Figure 2

(A-D) Ventral view of whole mount blastoderm embryos stained for sna mRNA (red) and DAPI nuclear stain (blue). A) D. melanogaster. B) D. simulans. C) Hybrid embryo from D. melanogaster mother and D. simulans father. D) Hybrid embryo from D. simulans mother and D. melanogaster father. E, F) High magnification of boxed areas in C and D, respectively. Note the presence of two nuclear transcription dots per nucleus in cells along the border of sna expression, indicating that both copies of the sna gene from each species are activated. The abutting cells outside the mesoderm have both sna copies turned off. Similar results were obtained for twi (See Fig. S2) and hybrids between D. sechellia and D. melanogaster (not shown).