19069
To investigate the role of calmodulin in the import of DdCAD - 1 into contractile vacuoles , an in vitro import assay consisting of contractile vacuoles derived from cadA ( - ) cells and recombinant proteins was employed .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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