( ( ( ( ( It ( is ( as ( though ( ( reduction ( in ( levels ( of ( the ( 23C gamma-tubulin ) ) ) ) ) ) ( ( lead ( to ( ( a ( limited numbers ) ) ( of ( chromosome ( duplication cycles ) ) ) ) ) ) ( in ( ( the absence ) ( of mitosis ) ) ) ) ) ) ) ) ) , ) but ) ( this ( is ( followed ( by ( interphase ( cell ( cycle arrest ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (PRP It)) (VP (VBZ is) (SBAR (RB as) (IN though) (S (NP (NP (NN reduction)) (PP (IN in) (NP (NP (NNS levels)) (PP (IN of) (NP (DT the) (CD 23C) (NN gamma-tubulin)))))) (VP (VBP lead) (PP (TO to) (NP (NP (DT a) (JJ limited) (NNS numbers)) (PP (IN of) (NP (NN chromosome) (NN duplication) (NNS cycles))))) (PP (IN in) (NP (NP (DT the) (NN absence)) (PP (IN of) (NP (NNS mitosis)))))))))) (, ,) (CC but) (S (NP (DT this)) (VP (VBZ is) (VP (VBN followed) (PP (IN by) (NP (JJ interphase) (NN cell) (NN cycle) (NN arrest)))))) (. .)))
It is as though reduction in levels of the 23C gamma-tubulin lead to a limited numbers of chromosome duplication cycles in the absence of mitosis, but this is followed by interphase cell cycle arrest.
(ROOT (S (NP (DT The) (NNS chromosomes)) (VP (VB duplicate) (PP (IN in) (NP (DT the) (JJ interphase) (NN phase)))) (. .)))