1649
The cloned HindIII fragment , which was shown by DNA sequence analysis to encode the N - terminal half of the B . subtilis IF2 protein and 0 . 2 kb of upstream flanking sequence , was utilized as a homologous probe to clone an overlapping 2 . 76 - kb ClaI chromosomal fragment containing the entire IF2 structural gene .
 HindIII fragment, B . subtilis IF2 protein, 2 . 76 - kb ClaI chromosomal fragment, entire IF2 structural gene
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 HindIII fragment, B . subtilis IF2 protein, 2 . 76 - kb ClaI chromosomal fragment, entire IF2 structural gene