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Expression of osteoblast markers during ontogeny and regeneration is in the lateral osteoblast compartment. Ontogeny is on the left, 5 dpa regenerating fin is in the middle, cryosection of 5 dpa regenerating fins is on the right. (A,B,C) runx2a; (D,E,F) runx2b; (G,H,I) osx; (J,K,L) spp-1. Cells expressing all genes are located medial to the deposited bone matrix (arrows).
