Imagine that you stably transfected a small group of cells at the margin of the posterior neural plate as indicated in the figure. You transfected the cells with a constitutively expressed reporter gene such as green fluorescent protein (GFP). All cells generated by the division of the transfected cells would express GFP. Thus, you can follow the lineage of the cells that you originally transfected. What cell type(s) in the adult would you expect to express GFP and where would you expect to find them?
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