6744
Retinoid - dependent activation of the tissue transglutaminase promoter depends on both a proximal regulatory region containing sequences highly conserved between the human and the mouse tissue transglutaminase promoters and a distal region that includes a 30 - base pair retinoid response element ( mTGRRE1 ) . mTGRRE1 contains three hexanucleotide half - sites ( two canonical and one non - canonical ) in a DR7 / DR5 motif that bind both RAR * RXR heterodimers and RXR homodimers .
 tissue transglutaminase promoter, mouse tissue transglutaminase promoters, DR7, DR5, RAR, RXR, RXR homodimers
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 tissue transglutaminase promoter, mouse tissue transglutaminase promoters, DR7, DR5, RAR, RXR, RXR homodimers