3 dpf Development
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|Description||By 72 hpf, the opercle (op) consists of a linear spicule of bone matrix surrounded by tightly packed osteoblasts. The opercle articulates along its dorsal tip with the hyosymplectic cartilage (not visible here) through a ball and socket joint. At this time, opercle growth occurs ventrally through the addition of osteoblasts in a linear fashion that parallels the existing bone (data not shown). Faint EGFP-derived fluorescence throughout the image is derived from transgene expression in the ectoderm.|