25007
Normal ( e . g . , adhesion ) and lateral ( friction ) forces were measured between physisorbed and chemically grafted layers of hyaluronic acid ( HA ) , an anionic polyelectrolyte in the presence of lubricin ( Lub ) , a mucinous glycoprotein , on mica surfaces using a surface forces apparatus ( SFA ) .
 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