This family consists of several eukaryotic SF-assemblin and related beta giardin proteins. During mitosis the SF-assemblin-based cytoskeleton is reorganized; it divides in prophase and is reduced to two dot-like structures at each spindle pole in metaphase. During anaphase, the two dots present at each pole are connected again. In telophase there is an asymmetrical outgrowth of new fibers. It has been suggested that SF-assemblin is involved in re-establishing the microtubular root system characteristic of interphase cells after mitosis.