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RNA blot hybridizations identified an 1 . 8 - kb mRNA common to cytochrome b6 and subunit IV , and an intensely hybridizing 0 . 8 - kb mRNA specific to the subunit IV gene probe .
 GENE: cytochrome b6
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: cytochrome b6