813
There was a significant correlation between tubular diameter and spg ( r = 0 . 68 , P less than 0 . 001 ) suggesting that tubular diameter measurements in histological sections could be used to predict sperm production .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
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