Results of non-invasive DNA sampling of writing supports.

n = sample size. Each sampling method was tested twice on each material. PCR was conducted in triplicate for each sample. PCR success is given as the number of PCR products (visualized by gel electrophoresis) for different amplicon lengths (791 bp, 500 bp, and 114/ 120bp). n.a. = not analyzed.n为样本量。每种采样方法针对每份材料均开展两次重复实验。每份样本的聚合酶链式反应（PCR）均设置三次重复。PCR扩增成功率以不同扩增子长度（791 bp、500 bp及114/120 bp）对应的PCR产物数量（经凝胶电泳可视化）进行统计表征。n.a. 表示未进行分析。