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Homologous recombination between the Autographa californica nuclear polyhedrosis virus ( AcNPV ) genome and a 0 . 6 - kbp - long DNA fragment derived from the putative DNA helicase gene of Bombyx mori nuclear polyhedrosis virus generates eh2 - AcNPV , an expanded - host - range AcNPV mutant ( S .
 DNA helicase gene of Bombyx mori nuclear polyhedrosis virus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 DNA helicase gene of Bombyx mori nuclear polyhedrosis virus