Expression and purification of different HCMV gH/gL, pentamer, and trimer complexes. (A) SDS-PAGE analysis of purified pentamer, trimer, gH/gL, and gH/gLC144S complexes under reducing conditions. P, pentamer complex; T, trimer complex. The ∼20-kDa band in the pentamer prep is likely a cleavage product of gL based on Western blot analysis. (B and C) Superdex 200 size exclusion chromatography profiles of pentamer, trimer, and gH/gLC144S at two concentrations.