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

_ stats: contacts=5 Nring=2 specif=0.40
_ PDBs:  1:6fqp_B,
_ -lnE:  1:7.8,
_        1
0042 Q  NC
0045 K* IC
0046 W  NA
0049 N* RG
0050 F  RG