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When some species , including " Bathyctena chuni " , " Euplokamis stationis " and " Eurhamphaea vexilligera " , are disturbed , they produce secretions ( ink ) that luminesce at much the same wavelengths as their bodies .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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