21687
The organic layer is reminiscent of tribochemical reaction layers that form on the surface of CoCrMo hip bearings , suggesting that these types of layers can be formed by purely electrochemical means .
 Chemical: CoCrMo
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: CoCrMo