Predicted to enable actin monomer binding activity. Predicted to be involved in positive regulation of cell migration and sequestering of actin monomers. Predicted to act upstream of or within negative regulation of actin filament polymerization and negative regulation of stress fiber assembly. Predicted to be located in stress fiber. Predicted to be part of filamentous actin. Predicted to be active in cytoplasm. Orthologous to human TMSB15A (thymosin beta 15A) and TMSB15B (thymosin beta 15B). [provided by Alliance of Genome Resources, Apr 2022]