Human Jak2 containing the catalytic and the pseudo kinase domain, also known as Janus kinase-2, Just Another Kinase 2, Jak-2-JH1 and JH2, GenBank Accession No. NM_004972, a.a. 513-1132(end), with V617F mutation; with N-terminal GST-Tag and C-terminal Avi-Tag, co-expressed with PTP1B for dephosphorylation in HEK293 expression system. This protein is enzymatically Biotin-labeled using Avi-Tag™ technology. Biotinylation is confirmed to be ≥90%. MW=100 kDa.