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Aim of the present study was the characterization of the RORa receptor (Retinoidrelated Orphan Receptor a). RORa is a member of the nuclear receptor family and is involved into the differentiation of Purkinje cells, inflammation, arteriosclerosis, and bone mineralization. Nuclear receptors are transcription factors and mediate biological responses within target cells to outer signals such as lipophilic hormones. They are involved in development, growth, differentiation, proliferation, apoptosis, and maintenance of homeostasis. Ligand binding, posttranslational modifications, and cofactor recruitment control their activity. Nearly all nuclear receptors share a common modular structure with an Nterminal A/B region, a DNA-binding domain (DBD) that is composed of two zinc finger motifs, a hinge region, and a C-terminal ligand-binding domain (LBD). The RORs comprise the subtypes RORa, RORb, and RORg, which are encoded by different genes. All isoforms of the respective subtypes only differ in their A/B domain. This study focused mainly on the exploration of the gene structure, expression, and subcellular distribution of RORa...