19489
By electron microscopy of isolated peptidoglycan sacculi , the submicroscopic structure of the cell junctions could be visualized , revealing a novel function for a cell wall amidase : AmiC2 drills holes into the cross - walls , forming an array of ~ 155 nanopores with a diameter of ~ 20 nm each .
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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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