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The Caenorhabditis elegans vitellogenin genes are subject to sex - , stage - , and tissue - specific regulation : they are expressed solely in the adult hermaphrodite intestine .
 Caenorhabditis elegans vitellogenin genes
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Caenorhabditis elegans vitellogenin genes