( ( ( ( Effect ( of ritonavir ) ) ( on ( ( lipids and ) ( post-heparin ( lipase activities ) ) ) ) ) ( in ( normal subjects ) ) ) . )
(ROOT (NP (NP (NN Effect)) (PP (IN of) (NP (NN ritonavir))) (PP (IN on) (NP (NP (NNS lipids)) (CC and) (NP (JJ post-heparin) (NN lipase) (NNS activities)))) (PP (IN in) (NP (JJ normal) (NNS subjects))) (. .)))
Effect of ritonavir on lipids and post-heparin lipase activities in normal subjects.
(ROOT (S (NP (NNS Lipids)) (VP (VBP are) (VP (VBN broken) (PRT (RP down)) (PP (IN by) (NP (NNS lipases))))) (. .)))