12347
Fifty - six semen samples were included in this study ; 18 were subnormal ( G1 ) and 38 were normal ( G2 ) based on World Health Organization criteria , except for morphology , which was evaluated according to strict criteria .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
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