passages.id: split_4_test_930_passage
passages.type: progene_text
passages.text: Utilizing the rOC and mOP VDREs , two distinct repressive actions of TR on VDR - mediated signaling were demonstrated : a T(3) - independent action , presumably via direct TR - RXR competition for DNA binding , and a T(3) - dependent repression , likely by diversion of limiting RXR from VDR - RXR toward the formation of TR - RXR heterodimers .