短語詞組短語helix x structure 螺旋結構DNA double helix structure DNA 雙螺旋結構double helix structure 雙螺旋結構;雙股螺旋結構unequal helix structure 不等螺旋線結構transmembrane helix structure 跨膜螺旋結構Polyproline type II Helix Structure PPII 螺旋結構tape helix slow wave structure 帶狀螺旋慢波結構double helix structure of dna dna 雙螺旋結構 返回 helix structure