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Reproductive toxicity of phthalate esters ( PEs ) occurs in rat offspring exposed in utero , a phenomenon that is better studied in male offspring than females .
 Chemical: phthalate esters; Chemical: PEs
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: phthalate esters; Chemical: PEs