Matrix of similar interfaces for 3D-footprint entry 3exj_A

_ stats: contacts=5 Nring=4 specif=0.80
_ PDBs:  1:7xzx_N,2:5kbd_B,
_ -lnE:  1:24.5,2:12.6,
_        1 2
0147 R* --RG
0175 A* ATAT
0176 C* CTCT
0179 R* RGRG
0180 D  DT--