Fig. 2. Stereoview of the dimeric hCD81-LEL. The view, generated with MOLSCRIPT and RASTER3D (Kraulis, 1991; Merritt and Murphy, 1994), shows the two subunits in blue and purple. The helix labels are distinguished in the two protomers by a prime. The molecular 2-fold axis is close to vertical (A) and located between the N- and C-termini of the two chains. Solid dots (in the purple subunit) trace an approximate path for residues 238–241 not observed in the electron density maps. In (B), the 2-fold axis is orthogonal to the drawing plane. (C) Stereoview of the hCD81-LEL isolated protomer. The view highlights the head subdomain localization relative to the N- and C-terminal helices (α-helices A and E, respectively), and the labeling of secondary structure elements. The two disulfide bridges are shown in yellow.