4396
Here , we describe the crystal structure at 2 . 5 A resolution of a fragment of the integrase of Rous sarcoma virus ( residues 49 - 286 ) containing both the conserved catalytic domain and a modulatory DNA - binding domain ( C domain ) .
 GENE: integrase of Rous sarcoma virus ( residues 49 - 286 )
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: integrase of Rous sarcoma virus ( residues 49 - 286 )