Nanobody activator improves sensitivity of the von Willebrand factor activity assay to multimer size. - Liang Q; Parker ET; Dean G; Karpen MS; Wu Y; Wang X; Di Paola J; Maier CL; Meeks SL; Lollar P; Sidonio RF; Li R (Journal of thrombosis and haemostasis : JTH, 2024)