( ( Certain microorganisms ) ( ( have ( ( a ( light-sensitive region ) ) ( that ( enables ( them ( to ( ( move ( ( towards or ) away ) ) ( from ( ( high ( light intensities ) ) ( -LRB- ( ( ( positive ( and ( negative phototaxis ) ) ) respectively ) -RRB- ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Certain) (NNS microorganisms)) (VP (VBP have) (NP (NP (DT a) (JJ light-sensitive) (NN region)) (SBAR (WHNP (WDT that)) (S (VP (VBZ enables) (S (NP (PRP them)) (VP (TO to) (VP (VB move) (ADVP (RB towards) (CC or) (RB away)) (PP (IN from) (NP (NP (JJ high) (JJ light) (NNS intensities)) (PRN (-LRB- -LRB-) (S (NP (JJ positive) (CC and) (JJ negative) (NNS phototaxis)) (ADJP (RB respectively))) (-RRB- -RRB-)))))))))))) (. .)))
Certain microorganisms have a light-sensitive region that enables them to move towards or away from high light intensities (positive and negative phototaxis respectively).
(ROOT (S (NP (NNS Phototaxis)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (NN movement)) (PP (IN toward) (NP (NN light))))))) (. .)))