Matrix of similar interfaces for 3D-footprint entry 5u91_B

_ stats: contacts=3 Nring=1 specif=0.33
_ PDBs:  1:1a31_A,2:2h7g_X,3:3t79_A,
_ -lnE:  1:10.0,2:9.2,3:8.0,
_        1 2 3
0187 T  KA----
0189 V  --KT--
0244 Y* ----LT