Crystallographic data collection and refinement statistics.

aValues for the highest resolution shell in parentheses.
bRobs = ∑|Ij−<I>|/∑ Ij , where Ij is the measured intensity of reflection j, and <I> is the mean intensity of symmetry-related reflections.
cTen percent of reflections were randomly assigned to Rfree set.
dProgram PROCHECK [50].

a 括号内为最高分辨率壳层的对应数值。
b 观测R因子（Robs）= Σ|Iⱼ - ⟨I⟩| / ΣIⱼ，其中Iⱼ为衍射点j的实测强度，⟨I⟩为对称等价衍射点的平均强度。
c 随机选取10%的衍射点分配至Rfree测试集。
d 采用PROCHECK程序[50]。