Matrix of similar interfaces for 3D-footprint entry 7xv6_B

_ stats: contacts=5 Nring=4 specif=0.80
_ PDBs:  1:4umm_E,2:5krb_G,
_ -lnE:  1:11.6,2:11.1,
_        1 2
0022 E* EAEC
0025 K* KGKG
0029 K* RT--
0030 R* RTRA
0054 N  RT--