CD44 and infection: The following eight IN quadruple mutants were tested in single-round infection assays (Table 1): E92Q/E138A/G140S/Q148H, E92Q/E138K/G140S/Q148H, T97A/E138A/140S/Q148H, T97A/E138K/140S/Q148H, L74M/E138A/G140S/Q148H, L74M/E138K/G140S/Q148H, L74I/E138A/G140S/Q148H, and L74I/E138K/G140S/Q148H.