13138
The role of polyphosphates in mammalian systems , where they are ubiquitous in cells , tissues and bodily fluids , and are at particularly high levels in osteoblasts , is not well understood .
 Chemical: polyphosphates
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: polyphosphates