30446
Hypothalamic tuberoinfundibular dopamine ( TIDA ) neurons remain unaffected in Parkinson disease ( PD ) while there is significant degeneration of midbrain nigrostriatal dopamine ( NSDA ) neurons .
 dopamine, dopamine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 dopamine, dopamine