. . "thin structure composed of a single thickness of cells"@en-us . . . . . . "layer"@en-us . . "0"^^ . . . . "101463259"^^ . . . . . . . "101386578"@en-us . . . "100988305"@en-us . . . . . . "01463259-n"^^ . . . "0"^^ . . . . . . . . . . . "layer"^^ . . . .