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

_ stats: contacts=5 Nring=2 specif=0.40
_ PDBs:  1:6fqq_E,2:6fqp_B,
_ -lnE:  1:8.1,2:7.8,
_        1 2
0042 Q  NCNC
0045 K* ITIC
0046 W  NANA
0049 N* RGRG
0050 F  RGRG