This family is a set of eukaryotic tropomyosins. Within the yeast Tpm1 and Tpm2, biochemical and sequence analyses indicate that Tpm2p spans four actin monomers along a filament, whereas Tpm1p spans five. Despite its shorter length, Tpm2p can compete with Tpm1p for binding to F-actin. Over-expression of Tpm2p in vivo alters the axial budding of haploids to a bipolar pattern, and this can be partially suppressed by co-over-expression of Tpm1p. This suggests distinct functions for the two tropomyosins, and indicates that the ratio between them is important for correct morphogenesis. The family also contains higher eukaryote Tpm3 members.