( ( ( ( ( The ( cone cells ) ) ( -LRB- ( ( for colour ) -RRB- ) ) ) and ) ( ( ( the ( rod cells ) ) ( -LRB- ( ( for ( low-light contrasts ) ) -RRB- ) ) ) ( in ( the retina ) ) ) ) ( ( ( ( ( detect and ) convert ) ( light ( into ( neural signals ) ) ) ) ( for vision ) ) . ) )
(ROOT (S (NP (NP (NP (DT The) (NN cone) (NNS cells)) (PRN (-LRB- -LRB-) (PP (IN for) (NP (NN colour))) (-RRB- -RRB-))) (CC and) (NP (NP (NP (DT the) (NN rod) (NNS cells)) (PRN (-LRB- -LRB-) (PP (IN for) (NP (JJ low-light) (NNS contrasts))) (-RRB- -RRB-))) (PP (IN in) (NP (DT the) (NN retina))))) (VP (VBP detect) (CC and) (VBP convert) (NP (NP (NN light)) (PP (IN into) (NP (JJ neural) (NNS signals)))) (PP (IN for) (NP (NN vision)))) (. .)))
The cone cells (for colour) and the rod cells (for low-light contrasts) in the retina detect and convert light into neural signals for vision.
(ROOT (S (NP (NP (DT The) (JJ light-sensing) (NNS cells)) (PP (IN in) (NP (DT the) (NN retina)))) (VP (VBP are) (VP (VBN called) (NP (NNS rods) (CC and) (NNS cones)))) (. .)))