( ( In metaphase ) ( I ( , ( ( pairs ( of ( chromosomes ( -LRB- ( ( each ( with ( sister chromatids ) ) ) -RRB- ) ) ) ) ) ( ( line up ) . ) ) ) ) )
(ROOT (S (PP (IN In) (NP (NN metaphase))) (NP (PRP I)) (, ,) (NP (NP (NNS pairs)) (PP (IN of) (NP (NP (NNS chromosomes)) (PRN (-LRB- -LRB-) (NP (NP (DT each)) (PP (IN with) (NP (JJ sister) (NNS chromatids)))) (-RRB- -RRB-))))) (VP (VB line) (PRT (RP up))) (. .)))
In metaphase I, pairs of chromosomes (each with sister chromatids) line up.
(ROOT (S (PP (IN In) (NP (JJ metaphase) (NN ii) (NN stage))) (, ,) (NP (NNS chromosomes)) (VP (VBP line) (ADVP (RB up) (NP (CD one)) (PP (IN on) (NP (NP (NN top)) (PP (IN of) (NP (DT each) (JJ other)))))) (PP (IN along) (NP (NP (DT the) (NN middle)) (PP (IN of) (NP (DT the) (NN cell))))) (, ,) (ADJP (JJ similar) (PP (TO to) (SBAR (WHADVP (WRB how)) (S (NP (PRP they)) (VP (VBP line) (PRT (RP up)) (PP (IN in) (NP (NNS mitosis))))))))) (. .)))