5186
We compared the inhibitory effect of naturally occurring mutant hTR beta 1 , artificially created hTR alpha 1 mutants , c - erbA alpha 2 and the human peroxisome proliferator - activated receptor ( hPPAR ) on three prototypic T3 - response elements ( TREs ) , TRE - PAL , DR + 4 and TRE - LAP .
 mutant hTR beta 1, hTR alpha 1 mutants, c - erbA alpha 2, human peroxisome proliferator - activated receptor, hPPAR
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 mutant hTR beta 1, hTR alpha 1 mutants, c - erbA alpha 2, human peroxisome proliferator - activated receptor, hPPAR