图2. G-四链体结构多样性.(a) G-四集体的四种链朝向;(b)三种主要的Loop连接方式;(c)单体分子内和双分子分子间G-四链体.红色箭头代表链从5’到3’朝向[3]
Fig.2. Structural diversity of G4 structures. (a) Four orientation of chains in G-tetrads; (b) Main three connection modes of loops; (c) Monomer or dimer G4 structure. The red arrow indicates the orientation from 5'-end to 3'-end[3]