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Fig. 2 | EvoDevo

Fig. 2

From: Formation and subdivision of the head field in the centipede Strigamia maritima, as revealed by the expression of head gap gene orthologues and hedgehog dynamics

Fig. 2

SP5/btd expression in conjunction with otx-B (a–d) and eve1 (e, f). All panels show ventral views. a (stage 2.2, early) An anterior cap of otx-B expression is directly anteriorly adjacent to the early ring-domain of SP5/btd. b (stage 2.3, early) A narrow gap has emerged between the antennal/intercalary SP5/btd expression and the more anterior otx-B expression. c (early stage 2.3) Photograph of only the SP5/btd stain shows ocular patches of SP5/btd expression anteriorly to antennal/intercalary domain. c′ Same specimen as c after otx-B stain, the strong part of the otx expression overlaps with ocular SP5/btd expression. Otx-B expression more anteriorly in the condensing head field (compare Additional file 4: figure S3) is barely visible due to reduced sensitivity of double stainings. d (stage mid-2.3, SP5/btd only) d′ (same specimen as d) Ocular otx-B expression is subdivided into lateral patches and a medial domain, the distance between ocular otx-B and antennal/intercalary SP5/btd expression has increased. e (stage 2.2) Broad expression of eve1 lies posteriorly adjacent to SP5/btd expression. f (stage 2.3) The posterior dynamic expression of eve1 resolves into single stripes of which the first lies directly posterior to the mandibular segmental SP5/btd expression (red arrowhead)

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