The reported values of the sTRAIL concentration in human blood in literature were highly variable, which might be related to the different assay kits used.

(A) Dot plot showing the distribution of the mean sTRAIL concentrations (in pg/ml) in healthy controls reported in 17 published articles. ELISA assay kits from different suppliers were indicated by different symbol shapes. (B) Results obtained in the present study from the same set of 16 samples using ELISA kits from three different suppliers.

(A) 点图展示了17篇已发表文献中报道的健康对照样本的平均可溶性肿瘤坏死因子相关凋亡诱导配体（sTRAIL）浓度（单位：pg/ml）的分布情况。不同供应商的ELISA检测试剂盒采用不同形状的符号进行标识。(B) 本研究针对同一组16份样本，使用3家不同供应商的ELISA试剂盒开展检测，所得的实验结果。