30445
Sustained resistance to acute MPTP toxicity by hypothalamic dopamine neurons following chronic neurotoxicant exposure is associated with sustained up - regulation of parkin protein .
 Chemical: MPTP; Chemical: dopamine
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: MPTP, dopamine 
Answer:
 Chemical: MPTP; Chemical: dopamine