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Expression of the human T cell receptor ( TCR ) alpha gene is regulated by a T cell - specific transcriptional enhancer that is located 4 . 5 kilobases ( kb ) 3 ' to the C alpha gene segment .
 GENE: T cell receptor ( TCR ) alpha gene; GENE: C alpha gene segment
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: T cell receptor ( TCR ) alpha gene; GENE: C alpha gene segment