4959
Furthermore , testes of lizards from exposed locations had significantly larger seminiferous tubule diameters , significantly higher number of spermatogenic layers and displayed an up - regulation of thyroid hormone receptors when compared with lizards from reference areas .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None