Table 1.

Statistics for fitting of C-terminal CA dimers into the reconstruction

PDB code	Cross-correlation	Number of contacts	Radial distance, Å
PDB3ds5	0.56	8	21
PDB1a8o	0.59	0	18
PDB3ds2	0.59	118	19
PDB2ont	0.62	23	23

Number of contacts is number of atomic contacts between neighboring dimers around the hexamer. Radial distance is the difference in radial position between S146 in the N-terminal domain and D152 in the C-terminal domain. If these were linked by a beta-strand, they would be separated by 21 Å.