“…The entire complement of S-class genome segments (for example, Chiu and Lee, 1997;Duncan, 1999;Liu and Huang, 2001;Bodelon et al, 2001;Shmulevitz et al, 2002;Kapczynski et al, 2002;Sellers et al, 2004) and M-class genome segments (for example, Touris-Otero et al, 2004;Noad et al, 2006) have been determined for some ARV clones. These sequence determinations include two strains (ARV138 and ARV176) which have served as useful genetic reagents; panels of intertypic reassortants (Duncan and Sullivan, 1998;O'Hara et al, 2001) and several temperature-sensitive mutants ) have been derived from these strains. Sequence information is also available for some ARV L1 and L3 genome segments (Hsiao et al, 2002;Shen et al, 2007) (Table 1), but not for strains ARV138 and ARV176.…”