The efficiency of filter paper for purification of nucleic acids from various sources using respective Qiagen kits. (A) Tomato genomic DNAs purified using Qiagen DNeasy plant mini kit. (B) Tomato total RNAs purified using Qiagen RNeasy plant mini kit. (C) PCR products of a GUS fragment purified using Qiagen QIAquick PCR purification kit. (D) PCR products of GUS fragment recovered from an agarose gel using a Qiagen QIAquick gel extraction kit. (E) pUC -19 plasmid DNAs purified using a Qiagen QIAprep spin miniprep kit. For each panel, from left to right are (Q) nucleic acid purified in experiments using original Qiagen spin column, (G) reassembled spin column using two layers of Whatman glass microfiber filters (Grade GF/F), and (P) reassembled spin column using two layers of Whatman qualitative filter paper, (Grade 3) respectively. Upper panel is quantification data based on three experimental replicates normalized according to performance of the Qiagen kit; lower panel is an image of agarose gel electrophoresis for the same volume of purified nucleic acids.