Quantitative colorimetric assay. This assay has high sensitivity and excellent specificity for detection of human hnRNP A2/B1. No significant cross-reactivity or interference between human hnRNP A2/B1 and analogues was observed. Note: Limited by current skills and knowledge, it is impossible for us to complete the cross-reactivity detection between human hnRNP A2/B1 and all the analogues, therefore, cross reaction may still exist. Sample types: cell culture supernatants, plasma, serum. Range: 1.25 - 80 ng/ml. Precision: Intra-Assay: CV<8% / Inter-Assay: CV<10%. Time: 4.5 hours