( ( If ( ( the lipase ) ( attacks ( ( the lipid ) ( in ( the RBC ) ) ) ) ) ) ( mem . ) )
(ROOT (S (SBAR (IN If) (S (NP (DT the) (NN lipase)) (VP (VBZ attacks) (NP (NP (DT the) (NN lipid)) (PP (IN in) (NP (DT the) (NNP RBC))))))) (VP (VBP mem)) (. .)))
If the lipase attacks the lipid in the RBC mem.
(ROOT (S (NP (NNS Lipids)) (VP (VBP are) (VP (VBN broken) (PRT (RP down)) (PP (IN by) (NP (NNS lipases))))) (. .)))