|  | Class d: Alpha and beta proteins (a+b) [53931] (234 folds) | 
|  | Fold d.163: DNA breaking-rejoining enzymes [56348] (1 superfamily) core: alpha3-beta3-alpha4; one side of beta-sheet is exposed | 
|  | Superfamily d.163.1: DNA breaking-rejoining enzymes [56349] (2 families)  | 
|  | Family d.163.1.1: Lambda integrase-like, catalytic core [56350] (5 proteins) | 
|  | Protein Cre recombinase [56355] (1 species) | 
|  | Bacteriophage P1 [TaxId:10678] [56356] (9 PDB entries) | 
|  | Domain d1crxa2: 1crx A:130-341 [42157] Other proteins in same PDB: d1crxa1, d1crxb1 | 
|  | Domain d1crxb2: 1crx B:130-341 [42158] Other proteins in same PDB: d1crxa1, d1crxb1 protein/DNA complex | 
|  | Domain d1drga2: 1drg A:130-343 [64793] Other proteins in same PDB: d1drga1 mutant | 
|  | Domain d1f44a2: 1f44 A:130-343 [64983] Other proteins in same PDB: d1f44a1 mutant | 
|  | Domain d1kbua2: 1kbu A:130-341 [72285] Other proteins in same PDB: d1kbua1, d1kbub1 | 
|  | Domain d1kbub2: 1kbu B:130-341 [72287] Other proteins in same PDB: d1kbua1, d1kbub1 | 
|  | Domain d1ma7a2: 1ma7 A:130-341 [84922] Other proteins in same PDB: d1ma7a1, d1ma7b1 | 
|  | Domain d1ma7b2: 1ma7 B:130-341 [84924] Other proteins in same PDB: d1ma7a1, d1ma7b1 mutant | 
|  | Domain d2crxa2: 2crx A:130-341 [42159] Other proteins in same PDB: d2crxa1, d2crxb1 | 
|  | Domain d2crxb2: 2crx B:130-341 [42160] Other proteins in same PDB: d2crxa1, d2crxb1 protein/DNA complex | 
|  | Domain d3crxa2: 3crx A:130-341 [42161] Other proteins in same PDB: d3crxa1, d3crxb1 | 
|  | Domain d3crxb2: 3crx B:130-341 [42162] Other proteins in same PDB: d3crxa1, d3crxb1 protein/DNA complex; mutant | 
|  | Domain d4crxa2: 4crx A:130-341 [42155] Other proteins in same PDB: d4crxa1, d4crxb1 | 
|  | Domain d4crxb2: 4crx B:130-341 [42156] Other proteins in same PDB: d4crxa1, d4crxb1 mutant | 
|  | Domain d5crxa2: 5crx A:130-340 [42163] Other proteins in same PDB: d5crxa1, d5crxb1 | 
|  | Domain d5crxb2: 5crx B:130-314 [42164] Other proteins in same PDB: d5crxa1, d5crxb1 mutant | 
Timeline for Protein Cre recombinase from d.163.1.1: Lambda integrase-like, catalytic core: