Task: Named Entity Recognition
Input (English):  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 .
Output (English): sigma 1