The scientific article "Multiple mechanisms of chicken ovalbumin upstream promoter transcription factor (COUP-TF) mediated repression of transactivation" examines how the COUP-TF protein inhibits gene activation triggered by Vitamin D3, thyroid hormones, and retinoic acid. The research indicates that this repression, which allows the protein to suppress various receptors, does not occur through the formation of inactive heterodimers. Read the full article on ScienceDirect .