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While all deletions within the sequence coding for the mature tRNA led to inactivity of the mutated genes , substitution of the central portion by concatenated Hind III linkers produced gene units active in transcription .
 GENE: concatenated Hind III linkers
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: concatenated Hind III linkers