Matrix of similar interfaces for 3D-footprint entry 3c2i_A

_ stats: contacts=6 Nring=3 specif=0.50
_ PDBs:  1:4lg7_A,2:3vxv_A,3:2ky8_A,
_ -lnE:  1:9.4,2:7.1,3:7.1,
_        1 2 3
0020 R* RGRGRG
0025 S  TTTG--
0028 K  RTKTKC
0030 D* --DT--
0040 A  --KT--
0042 R* RGRGRG