Lineage for Fold b.139: Surface presentation of antigens (SPOA)
- Root: SCOP 1.75
Class b: All beta proteins [48724] (174 folds) 
Fold b.139: Surface presentation of antigens (SPOA) [101800] (1 superfamily)
segment-swapped dimer forming two identical conjoint barrels (n=6, S=10) topologically similar to the FMN-binding split barrel
Superfamily:
b.139.1: Surface presentation of antigens (SPOA) [101801] (1 family) 
More info for Fold b.139: Surface presentation of antigens (SPOA)
Timeline for Fold b.139: Surface presentation of antigens (SPOA):
- Fold b.139: Surface presentation of antigens (SPOA) first appeared in SCOP 1.67
- Fold b.139: Surface presentation of antigens (SPOA) appears in SCOP 1.73
- Fold b.139: Surface presentation of antigens (SPOA) appears in SCOPe 2.01
- Fold b.139: Surface presentation of antigens (SPOA) appears in the current release, SCOPe 2.08