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For example , the presence of two related genes , b and b ' , in the cyanobacterium suggests that its ATP synthase is a complex of nine polypeptides , and that it may have single copies of related b and b ' proteins rather than two copies of identical b subunits as found in the E . coli enzyme . 4 + off
 GENE: b; GENE: b '; GENE: ATP synthase; GENE: b; GENE: b ' proteins; GENE: b subunits
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: b; GENE: b '; GENE: ATP synthase; GENE: b; GENE: b ' proteins; GENE: b subunits