11541
Here , we identify specific mDA cell subpopulations that are consistently spared in adult Pitx3 - hypomorphic ( aphakia ) mice , demonstrating that Pitx3 is not indiscriminately required by all mDA neurons for their survival .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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