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Fig. 4. Close up views of expression patterns. (A) Bv-Crn (Coronin) expression in a pre-competent larva. Note expression in the mesenchymal cells at the base of the larval trunk. (B) Bv-Crn expression in a competent larva. Note expression in scattered mesenchyme cells that have migrated anteriorly along the trunk; also note the lack of strong staining in the papillae region, characteristic of the immune-related transcripts. (C) Bv-Ptx (Pentraxin) expression in newly settled juveniles. Note expression in the area of the resorbing cerebral vesicle (cv). (D) Bv-Tenc (Tenascin) expression in a juvenile shortly after settlement. Note expression in the papillae region (p), in the resorbing cerebral vesicle, in the tail and in the muscle granules (mg) which are undergoing phagocytosis. (E) Bv-Sccp2 (Selectin) expression in a juvenile two days after settlement. Note expression in the epidermis, particularly in the ampullae (amp), as well as in blood cells (bc) in and around the ampullae. (F) Bv-Ccp3 (Complement receptor) expression in a juvenile two days after settlement. This is a close up view of a single ampullae. Note expression in the ampullae epidermis and in the cytoplasm of blood cells around the ampullae.