Human Jak2 containing the catalytic and the pseudo kinase domain (a.a. 532-1132), also known as Janus kinase-2, Just Another Kinase 2, Jak-2-JH1, JH2, GenBank Accession No. NM_004972, with N-terminal GST-Tag and C-terminal Avi-TagTM co-expressed with PTP1B in HEK293 expression system. This protein is enzymatically Biotin-labeled using AviTag™ technology. Percentage of phosphorylation ≤ 10%. MW=100 kDa.