The recombinant human HVEM protein is typically expressed in HEK293 cells and includes a polyhistidine (His) tag at the C-terminus for purification purposes . The extracellular domain (ECD) of HVEM, which spans from Met1 to Val202, is the primary region used in recombinant protein production . The recombinant protein has a predicted molecular weight of approximately 19 kDa, but due to glycosylation, it appears as 33-38 kDa on SDS-PAGE under reducing conditions .