Figure 3.

Hierarchal tree analysis of crystallographic structures of RC _vir deposited in the Protein Data Bank. Crystal structures are sorted according to the mean difference of their internal distances, as described by Wickstrand et al. (2015 ▸). The LCP SFX structures described here (PDB entry 7q7p, data collected at SACLA; PDB entry 7q7q, data collected at SwissFEL) form their own cluster, but have a mean internal distance-matrix difference on C^α atoms of 0.35 Å relative to all other RC _vir structures. Although the space group (P2₁2₁2) is the same as that found for earlier LCP crystal structures of RC _vir , the unit cell has a significantly shorter c axis than that recovered in the low-temperature LCP crystal structures.