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With the discovery of their pharmacological activity in the late 1960s , implicating their high affinity for hydroxyapatite , bisphosphonates have been employed in the treatment of bone diseases and as targeting agents for colloids and drugs .
 Chemical: hydroxyapatite; Chemical: bisphosphonates
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: hydroxyapatite; Chemical: bisphosphonates