Possible role in modulating immune responses. Has an inhibitory effect on lymphocyte proliferation. Induces morphological changes including production of filopodia and microspikes when overexpressed in a variety of cell types and may be involved in dendritic cell maturation (By similarity). Also detected in a perinuclear region corresponding to the localization of the Golgi apparatus and throughout the cytoplasm. Belongs to the LST1 family.