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A second , novel C subunit ( CeCAT alpha ' , 374 residues ) has a unique 56 - residue carboxyl - terminal region that is generated by the alternative splicing of the C pre - mRNA .
 CeCAT alpha ', C pre - mRNA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 CeCAT alpha ', C pre - mRNA