Fimbrin (FIMB) is an actin filament bundling protein from chick. It
has two EF-hands at its N-terminus and four, 125 residue actin binding
domains, homologous to those of _-actinin, at its C-terminus . The
human homologs are I, L, and T-plastin whose genes are on chromosomes
3, 13, and X . Eventhough FIMB bears some similarities to ACTN,
their pairs of EF-hands are not closely related.