SPACI score report for 1nbz in ASTRAL 2.04:

PDB Entry: 1nbz
SPACI score: 0.45
AEROSPACI score: 0.45 (mutant; see below)

Experiment type: XRAY
Resolution: 1.85
R-factor: 0.229
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.659
WCK2 WHAT_CHECK Ramachandran: -0.658
WCK3 WHAT_CHECK Chi angles: -1.298
WCK4 WHAT_CHECK Backbone: 0.398

The AEROSPACI score for this entry is lower than the SPACI score because human-curated comments on the entry in SCOPe contain the phrase mutant. The full comment is: "part of anti-lysozyme Fab HYHEL-63; mutant; complexed with HYHEL-63"

Note: Here are links to pages about PROCHECK and WHAT_CHECK.

Here is the full WHAT_CHECK report on this protein (linked from the WHAT_CHECK site).