1436
We previously showed that heterozygous mice with an R740S mutation in the a3 subunit of V - ATPase ( + / R740S ) have mild osteopetrosis resulting from an ~ 90 % reduction in proton translocation across osteoclast membranes .
 None
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:  
Answer:
 None