( However ( , ( it ( ( is ( known ( ( ( ( that ( micelles ( ( are not ) ( absorbed intact ) ) ) ) , ) but ) ( that ( ( the fats ) ( , ( ( including cholesterol ) ( , ( ( ( ( pass ( through ( the ( brush ( border membrane ) ) ) ) ) ( into ( the cells ) ) ) , ) ( probably ( with ( ( the involvement ) ( of ( ( ( binding proteins ) and ) ( passive ( transport mechanisms ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB However)) (, ,) (NP (PRP it)) (VP (VBZ is) (VP (VBN known) (SBAR (SBAR (IN that) (S (NP (NNS micelles)) (VP (VBP are) (RB not) (VP (VBN absorbed) (S (ADJP (JJ intact))))))) (, ,) (CC but) (SBAR (IN that) (S (NP (DT the) (NNS fats)) (, ,) (PP (VBG including) (NP (NN cholesterol))) (, ,) (VP (VBP pass) (PP (IN through) (NP (DT the) (NN brush) (NN border) (NN membrane))) (PP (IN into) (NP (DT the) (NNS cells))) (, ,) (PP (ADVP (RB probably)) (IN with) (NP (NP (DT the) (NN involvement)) (PP (IN of) (NP (NP (VBG binding) (NNS proteins)) (CC and) (NP (JJ passive) (NN transport) (NNS mechanisms)))))))))))) (. .)))
However, it is known that micelles are not absorbed intact, but that the fats, including cholesterol, pass through the brush border membrane into the cells, probably with the involvement of binding proteins and passive transport mechanisms.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NNS substances)) (VP (VBP pass) (PP (IN through) (NP (DT the) (NN cell) (NN membrane))) (PP (IN without) (S (VP (VBG needing) (NP (DT any) (NN energy)))))))) (, ,) (NP (PRP it)) (VP (VBZ is) (VP (VBN called) (NP (JJ passive) (NN transport)))) (. .)))