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In these experiments we begin to study the potential functions of the alpha 7 cytoplasmic domain by analyzing homologies between the rat and human sequences , by immunologic studies using an anti - cytoplasmic domain antiserum , and by identifying two alternate forms .
 alpha 7 cytoplasmic domain
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 alpha 7 cytoplasmic domain