Table 1.

Retinoic acid (RA) entries in the PDB

A. All-trans retinoic acid entries in the PDB
PDB ID	Resolution (Å)	Protein Description	R/Rfree	SF
1CBR	2.90	Holo cellular RA-binding protein type I	0.251/0.320
1CBS	1.80	Holo cellular RA-binding protein type II	0.200/0.237
1EPB	2.20	Epididymal RA-binding protein	0.182	N/A
1FEM	1.90	Bovine plasma retinol-binding protein	0.184	N/A
1GX9	2.34	Bovine β-lactoglobulin	0.226/0.298	N/A
1N4H	2.10	Orphan nuclear receptor ROR-β	0.217/0.255	N/A
1RLB	3.10	Transthyretin and retinol-binding protein	0.215	N/A
2FR3	1.48	Apo-wild-type cellular RA-binding protein type II	0.131/0.174	N/A
2G78	1.70	The R132K:Y134F mutant of cellular RA-Binding protein type II	0.151/0.203	N/A
2LBD	2.06	Ligand-binding domain of the human RAR-γ	0.210/0.313
2VE3	2.10	Cyanobacterial cytochrome P450 CYP120A1	0.225/0.267
3CWK	1.60	Cellular RA-binding protein type II-R132K:Y134F:R111L:L121E:T54V	0.125/0.167

B. 9-cis retinoic acid entries in the PDB
PDB ID	Resolution (Å)	Protein Description	R/Rfree	SF
1FBY	2.25	Human RXR-α ligand binding domain	0.228/0.263	N/A
1FM6	2.10	Human RXR-α and PPAR-γ ligand binding domain	0.250/0.292
1FM9	2.10	Human RXR-α and PPAR-γ ligand binding domain	0.239/0.268
1G5Y	2.00	RXR-α ligand binding domain	0.231/0.254	N/A
1K74	2.30	Human RXR-α and PPAR-γ ligand binding domain	0.238/0.279	N/A
1TYR	1.80	Transthyretin	0.196	N/A
1XDK	2.90	RAR-β/RXR-α ligand binding domain	0.253/0.296
2ACL	2.80	Liver X receptor agonists	0.220/0.280
2NNH	2.60	Cytochrome P450	0.172/0.267
3LBD	2.40	Human nuclear receptor RAR-γ	0.210/0.313	N/A
3DZU	3.20	PAR-γ-RXR-α nuclear receptor complex on DNA	0.201/0.272
3DZY	3.10	PAR-γ-RXR-α nuclear receptor complex on DNA	0.213/0.268