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However , the sequence of mRAR - beta 3 region A differs from that of mRAR - beta 1 by an additional 27 C - terminal amino acids encoded in an 81 nucleotide - long putative exon which is spliced in between the exons encoding the A and B regions of mRAR - beta 1 .
 GENE: mRAR - beta 3 region A; GENE: mRAR - beta 1; GENE: A and B regions of mRAR - beta 1
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: mRAR - beta 3 region A; GENE: mRAR - beta 1; GENE: A and B regions of mRAR - beta 1