16637
The concentration of NR2A and NR2B subunits and nAChR alpha 7 , alpha 4 beta 2 isoforms in their offspring ' s hippocampi were measured by Western Blotting .
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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:
 None