Fig. 1

olMG cells re-enter the cell cycle after injury but do not generate neurogenic clusters.

(A–A’’) Cryosection of a needle-injured hatchling medaka retina of the transgenic line rx2::H2B-eGFP. PH3 stainings (magenta) on the hatchling medaka retinae 3 days post needle injury show mitotic cells present in the central retina (arrowhead), co-localizing with the rx2 nuclear reporter expression (green). (n = 4 fish, data obtained from two independent experiments). (B–B’’) Cryosection of a needle-injured hatchling medaka retina of the transgenic line rx2::H2B-eGFP. A 3-day pulse of BrdU marks proliferating cells in the central retina after needle injury (arrowheads). BrdU staining (magenta) co-localizes with rx2 nuclear reporter expression (green), indicating that olMG cells re-entered the cell cycle. (n = 6 fish, data obtained from three independent experiments). (C, C') Cryosection of a needle-injured hatchling medaka retina. BrdU-positive (magenta) single cells are present in the INL and ONL. (n = 6 fish, data obtained from two independent experiments). (D, D') Cryosection of a needle-injured zebrafish retina. BrdU-positive (magenta) neurogenic clusters are present in the INL. Additionally, BrdU-positive proliferating cells can be detected in the ONL (n = 3 fish, data obtained from two independent experiments). Scale bars are 10 μm.