Binds GTP and GDP (By similarity). Plays a role in uterine seam cell development (PubMed:25281934). Homodimer. Expressed in the spermatheca and spermathecal-uterine junction at the L4 lethargus stage of larval development and in uterine toroid cells of young adults. Not expressed during early and mid-L4 stages of larval development. RNAi-mediated knockdown results in defective uterine seam (utse) cell nuclear migration, defective utse cell outgrowth and irregular uterine lumen formation. Belongs to the small GTPase superfamily. Rab family.