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two other structures in the depth of the midbrain that are important for normal motor function are the red nucleus ( not visible ) and the substantia nigra .
 midbrain, nucleus
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: component whole, NA, instrument agency, member collection, cause effect, entity destination, content container, message topic, product producer, entity origin 
Text: {0} 
Answer:
 midbrain, nucleus