Human LCK, also known as Leukocyte C-terminal Src kinase, Lymphocyte cell-specific protein-tyrosine kinase, IMD22, and LSK, GenBank Accession No. NM_005356, a.a. 2- 509(end), with N-terminal GST-tag, expressed in Sf9 insect cells using a baculovirus expression system. MW=85 kDa.