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Mobilities of the purified circular forms of CEVd (371 nt), Potato spindle tuber viroid (359 nt), PLMVd (337 nt), ELVd, and ASBVd (247 nt) (lanes 1 to 5, respectively) after PAGE in 0.25× Tris-borate-EDTA-5% polyacrylamide gels containing 8 M urea and silver staining.
