PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 15832810-6 2005 Similarly, the steroid family of orphan nuclear receptors, the constitutive androstane receptor (CAR) and pregnane X receptor (PXR), both heterodimerize with the retinoid X receptor (RXR), are shown to transcriptionally activate the promoters of CYP2B and CYP3A gene expression by xenobiotics such as phenobarbital-like compounds (CAR) and dexamethasone and rifampin-type of agents (PXR). Phenobarbital 301-314 cytochrome P450 family 3 subfamily A member 4 Homo sapiens 256-261