Binds to F-actin and may modulate the chemotactic response during early development and contribute to the maintenance of the strength of the actin cytoskeleton. Expressed during the growth phase and early development. Levels start to decrease strongly after tight aggregates formation. Cells exhibit normal growth, but display altered morphology and F-actin distribution. They show changes in chemotactic motility associated with increased pseudopod formation, are significantly impaired in growth under stress conditions and highly sensitive to osmotic shock.