20718
Next , pulling experiments on living bacteria demonstrate that LGG pili exhibit two unique mechanical responses , that is , zipper - like adhesion involving multiple SpaC molecules distributed along the pilus length and nanospring properties enabling pili to resist high force .
 None
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