passages.id: split_5_test_2647_passage
passages.type: progene_text
passages.text: However , the available data do not distinguish two possibilities : When viewed clockwise from an extracellular viewpoint the subunits could be arranged in either gamma 2 beta 3 alpha 1 beta 3 alpha 1 or gamma 2 alpha 1 beta 3 alpha 1 beta 3 configurations .