( ( Tissue ( culture-based ( ELISA assays ) ) ) ( ( revealed ( that ( RWJ-270201 ( effectively ( ( inhibited ( ( the replication ) ( of ( influenza viruses ) ) ) ) ( in ( MDCK cells ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Tissue) (JJ culture-based) (NN ELISA) (NNS assays)) (VP (VBD revealed) (SBAR (IN that) (S (NP (NNP RWJ-270201)) (ADVP (RB effectively)) (VP (VBD inhibited) (NP (NP (DT the) (NN replication)) (PP (IN of) (NP (NN influenza) (NNS viruses)))) (PP (IN in) (NP (NN MDCK) (NNS cells))))))) (. .)))
Tissue culture-based ELISA assays revealed that RWJ-270201 effectively inhibited the  replication of influenza viruses in MDCK cells.
(ROOT (S (NP (NNP Tamiflu)) (VP (VBZ inhibits) (NP (NP (NN spread)) (PP (IN of) (NP (NN virus))))) (. .)))