SPACI score report for 2f3n in ASTRAL 1.73:

PDB Entry: 2f3n
SPACI score: 0.4
AEROSPACI score: 0.4 (mutant; see below)

Experiment type: XRAY
Resolution: 2.1
R-factor: 0.206
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 1.666
WCK2 WHAT_CHECK Ramachandran: 0.752
WCK3 WHAT_CHECK Chi angles: 0.283
WCK4 WHAT_CHECK Backbone: -2.931

The AEROSPACI score for this entry is lower than the SPACI score because human-curated comments on the entry in SCOP contain the phrase mutant. The full comment is: "mutant; automatically matched to 2F3N A:2-65; automated match to d2f3na1"

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).