Matrix of similar interfaces for 3D-footprint entry 1a6y_A

_ stats: contacts=5 Nring=4 specif=0.80
_ PDBs:  1:5e69_A,2:1hcq_E,
_ -lnE:  1:10.9,2:10.4,
_        1 2
0020 E* --EC
0023 K* KAKG
0024 G  VAAG
0027 R* --KG
0028 R* RARG