Possible role in cell-cell interactions. Minor involvement in the establishment of the oocyte anterior-posterior length. Heterodimer of an alpha and a beta subunit. Alpha-PS5 associates with beta-PS (By similarity). Expressed in all follicle cells overlying the oocyte during mid-oogenesis, the strongest expression is observed in the cells covering the anterior end of the oocyte and in the cells forming the dorsal appendages. After completion of oocyte enlargement, expression in main body follicle cells is down-regulated but persists strongly in the dorsal appendage forming cells. Expressed in lamellocytes. Expressed during mid- and late-oogenesis. Belongs to the integrin alpha chain family.