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The increased number of Leydig cells by di ( 2 - ethylhexyl ) phthalate comes from the differentiation of stem cells into Leydig cell lineage in the adult rat testis .
 di ( 2 - ethylhexyl ) phthalate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 di ( 2 - ethylhexyl ) phthalate