15856
Our results indicate that varying the ligand length has a direct effect on the colloidal arrangement of the system in a magnetic field , producing differences in the rate and size of chain formation , and hence systematic changes in transverse relaxation rates over time .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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