( ( The synctium ) ( ( ( is ( advantageous ( to ( the virus ) ) ) ) ( since ( it ( means ( that ( ( the virus ) ( ( ( ( ( does n't ) ( have ( to ( be ( released ( from ( host cell ) ) ) ) ) ) ) , ) but ) ( can ( ( spread ( unchecked cell ) ) ( to cell ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN synctium)) (VP (VBZ is) (ADJP (JJ advantageous) (PP (TO to) (NP (DT the) (NN virus)))) (SBAR (IN since) (S (NP (PRP it)) (VP (VBZ means) (SBAR (IN that) (S (NP (DT the) (NN virus)) (VP (VP (VBZ does) (RB n't) (VP (VB have) (S (VP (TO to) (VP (VB be) (VP (VBN released) (PP (IN from) (NP (NN host) (NN cell))))))))) (, ,) (CC but) (VP (MD can) (VP (VB spread) (NP (ADJP (JJ unchecked)) (NN cell)) (PP (TO to) (NP (NN cell)))))))))))) (. .)))
The synctium is advantageous to the virus since it means that the virus doesn't have to be released from host cell, but can spread unchecked cell to cell.
(ROOT (S (NP (NNP Tamiflu)) (VP (VBZ inhibits) (NP (NP (NN spread)) (PP (IN of) (NP (NN virus))))) (. .)))