4567
A significantly enhanced accumulation of MP in ulcerous lesions was observed ( covered area = 1 . 28 % ( range 0 . 83 % - 3 . 45 % ) vs . 0 % in controls ; p = 0 . 011 ) , while NP were visible only in traces on mucosal surfaces of all patients .
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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