13139
In cell - free systems , polyphosphates inhibit hydroxyapatite nucleation , crystal formation and growth , and solubility .
 Chemical: polyphosphates
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: polyphosphates 
Answer:
 Chemical: polyphosphates