Matrix of similar interfaces for 3D-footprint entry 1an4_A

_ stats: contacts=7 Nring=4 specif=0.57
_ PDBs:  1:7xi3_B,2:2ypa_A,
_ -lnE:  1:8.1,2:7.9,
_        1 2
0005 R  --RT
0008 H  TA--
0009 N  --NT
0011 V* --RG
0012 E* SAEC
0015 R* RGRC
0016 R* RGQT