5 dpf Development
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|Description||At 120 hpf, the opercle (op) is now fan-shaped, with a high density of osteoblasts along the fast-growing ventral edge. A single layer of osteoblasts outlines the other, more slowly growing edges of the bone. Branchiostegal ray 3 (bsr3) has grown posteriorly away from its articulation with the ceratohyal (not visible here), and is lined by osteoblasts along its posteroventral edge. Initial ossification and osteoblasts of the interopercle (iop) are apparent at this time between the branchiostegal ray 3 and opercle. Bone matrix of the hyomandibula (hm) can be seen in the perichondrium of the hyosymplectic (not visible here), although the flattened, small osteoblasts of the hyomandibula are not seen at this magnification. Faint EGFP-derived fluorescence throughout the image is derived from transgene expression in the ectoderm|