Members of the DUP240 multigene family are specific to S.cerevisiae sensu strictu. Cells lacking all 10 DUP240 proteins show no obvious alterations in mating, sporulation and cell growth. Has been shown to be a pseudogene in S288c, CLIB 95, CLIB 388, R12, YIIc12 and YIIc17, due to a naturally occurring frameshift at position 8 in these strains. The sequence shown is from strain Sigma 1278B, the closest phylogenetic relative of S288c. Belongs to the DUP/COS family.