Allosteric Regulation|Allosteric Site|Animals|Binding Sites|Cell Nucleus|Computer Simulation|Crystallography, X-Ray|Cyclin H|Gene Expression Regulation|Ligands|Mice|Phosphorylation|Protein Binding|Protein Structure, Secondary|Receptors, Retinoic Acid|Retinoic Acid Receptor alpha|Salts|Serine|Signal Transduction|Solvents|Transcriptional Activation|Tretinoin