3956
To probe the inter - relationship between the virion - anchoring function and the oligomerization function , we constructed two serotype 3 ( T3 ) sigma 1 deletion mutants in SV40 expression vectors , one lacking the hydrophobic tail and the hinge , and the other lacking an adjacent region which constituted part of the coiled - coil .
 GENE: sigma 1
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: sigma 1