8988
In the first three of these groups ( Chromista ) , the chloroplast has four membranes , retaining a nucleomorph in cryptomonads , and they likely share a common pigmented ancestor , although other evidence casts doubt on whether the heterokonts , Haptophyta , and cryptomonads are in fact more closely related to each other than to other groups .
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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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