24640
Our ultrastructural observation suggests that the membranous structure is the main action site of MCs in the kidney , among which mitochondria damage in the tubules is clearly an early , and presumably a critically important effect of MCs .
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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:
 None