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Autoradiographs showing that GFP and pointed P1 are enriched in the GFP-selected, posterior-derived A62+ cells. Amplified cDNA was prepared from sorted A62+ and A62− cells and blotted onto a nylon membrane. This membrane was hybridized to three successive radioactive oligonucleotides: the universally expressed ribosomal protein rp49, the reporter transgene GFP, and the posterior-expressed transcript pointed P1.
