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The Nostoc petBD genes are not closely linked to the psbB gene ( encoding the 51 - kDa photosystem II polypeptide ) and do not contain introns as do the closely related chloroplast genes .
 GENE: petBD genes; GENE: psbB gene; GENE: photosystem II polypeptide
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: petBD genes; GENE: psbB gene; GENE: photosystem II polypeptide