AzadC was purchased from Sigma-Aldrich (St. Louis, MO); CpG methyltransferase (M.Sssl) was from New England Biolabs (Ipswich, MA); Decade markers (= 10-nt ladder) for small RNA Northern and yeast tRNA were from Ambion (Carlsbad, CA); and protein and DNA size markers were from GenDepot (Barker, TX). The source of antibodies was described in [1 (link), 2 (link)].
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