6319
Disturbance of dopamine function and of Ca ( 2 + ) metabolism can explain abnormal movement ; loss of protection against reactive oxygen species may account for the neurodegenerative changes in XDP .
 Chemical: Ca ( 2 + ); Chemical: oxygen
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: Ca ( 2 + ); Chemical: oxygen