Alpha-PS2/beta-PS is a receptor for Tig, wb and Ten-m. Involved in the function and/or development of the olfactory system. Heterodimer of an alpha and a beta subunit. The alpha subunit is composed of a heavy and a light chain linked by a disulfide bond. Alpha-PS2 associates with beta-PS. During mid-oogenesis, localizes to the apical, to the lateral and to the basal membranes of follicle cells. Apical membrane localization peaks at oogenesis stages 9 and 10A in columnar follicle cells overlying the oocyte while decreases in the most posterior follicle cells. During embryogenesis, at the end of germband extension concentrates at the basal membrane of mesodermal cells, where they adhere to the ectoderm. Then, in visceral mesoderm localizes basally, whereas in somatic mesoderm is homogenously distributed. In ovaries, highly expressed in follicle cells. At syncytial blastoderm stage, expressed in the embryonic mesodermal precursors but not in the ectoderm. At embryonic stages 7 and 10, expression is restricted to the mesoderm. At stage 12, expressed in the gonadal sheath and the interstitial cells of the gonad. In stage 16 embryos, expressed in the somatic and visceral muscles where localizes to sites of attachment between adjacent muscles. In third larval instar wing imaginal disk, expressed in the ventral compartment and in a subset of adepithelial and peripodial cells (at protein level). Expressed throughout embryonic and larval development with peaks of expression during mid-embryogenesis and at third larval instar (at protein level). The relative ratio of isoform 1/PS2C and isoform 2/PS2M8 varies widely during development. The heavy-light chain cleavage site is either in 1230-1231, or 1233-1234, or 1243-1244. Belongs to the integrin alpha chain family. Extended N-terminus. Contaminating sequence. Potential poly-A sequence.