FIG. 1.

TGEV M protein topologies in the virus envelope. Scheme of the topologies adopted by the M protein, the Nexo-Cendo topology (left) and the Nexo-Cexo topology (right), showing the MAbs used in this report and the approximate locations of the M protein epitopes recognized by them. The domain of the M protein that interacts with the nucleocapsid is indicated as a wide bar between residues 237 and 252. Ext, external surface of the virion; Int, virion interior. Arrows indicate approximate amino acid positions in the M protein.