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. 2017 Jun 5;216(6):1833–1847. doi: 10.1083/jcb.201611057

Figure 7.

Figure 7.

Working model for RSC lineage specification. Fast-cycling bipotent cells (BPs; in blue) of the ML in developing optic vesicles migrate and proliferate into one PP (in black) and one SP (in red) between 18 and 26 hpf. Subsequently, slow-cycling SPs proliferate and produce three types of lineages, including two asymmetric lineage types and one symmetric lineage type. Two asymmetric lineages were composed of one RSC (S; in red) and one dormant CMZ tip cell (D; in black/red; 60% of total RSC-generating lineages) or one RSC and a retinal progenitor (RP; in red; 38%). One symmetric lineage contained two RSCs (in red; 2%). Meanwhile, PPs proliferated and produced two types of lineages, including the lineages of two pigmented cells (Ps; in black; 64%) and the lineages of one pigmented cell (in black) and one CMZ dormant tip cell (36%). Note that dormant CMZ tip cells are produced by both PPs and SPs.