A method of making a touch fastener includes coextruding, side-by-side, a plurality of lanes of polymeric material to form a sheet-form base. Namely, a selection marker comprising a quinolinate phosphoribosyltransferase gene isolated from Aspergillus oryzae. The first and third regions are located respectively along two opposite edges of the curved display apparatus, while the second region is located between the first and third regions.