( ( ( ( ( ( Whether or ) not ) ( the lipid ) ) ( A portion ) ) ( of LPS ) ) ( also ( ( plays ( ( ( an ( important role ) ) ( in symbiosis ) ) ( is unknown ) ) ) . ) ) )
(ROOT (S (NP (NP (ADVP (RB Whether) (CC or) (RB not) (NP (DT the) (NN lipid))) (DT A) (NN portion)) (PP (IN of) (NP (NNP LPS)))) (ADVP (RB also)) (VP (VBZ plays) (SBAR (S (NP (NP (DT an) (JJ important) (NN role)) (PP (IN in) (NP (NNS symbiosis)))) (VP (VBZ is) (ADJP (JJ unknown)))))) (. .)))
Whether or not the lipid A portion of LPS also plays an important role in symbiosis is unknown.
(ROOT (S (NP (NNS Lipids)) (VP (VBP play) (NP (NP (JJ several) (JJ important) (NNS roles)) (PP (IN in) (NP (DT the) (JJ human) (NN body))))) (. .)))