( ( ( Photoreceptor cells ) ( of ( ( ( ( the retina ) , ) ( the ( ( rods and ) cones ) ) ) , ) ) ) ( ( ( are ( responsible ( for ( ( ( ( the capture ) ( of light ) ) and ) ( ( the initiation ) ( of ( an ( electrical signal ) ) ) ) ) ) ) ) ( to ( ( the brain ) ( in ( ( the process ) ( of vision ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Photoreceptor) (NNS cells)) (PP (IN of) (NP (NP (DT the) (NN retina)) (, ,) (NP (DT the) (NNS rods) (CC and) (NNS cones)) (, ,)))) (VP (VBP are) (ADJP (JJ responsible) (PP (IN for) (NP (NP (NP (DT the) (NN capture)) (PP (IN of) (NP (NN light)))) (CC and) (NP (NP (DT the) (NN initiation)) (PP (IN of) (NP (DT an) (JJ electrical) (NN signal))))))) (PP (TO to) (NP (NP (DT the) (NN brain)) (PP (IN in) (NP (NP (DT the) (NN process)) (PP (IN of) (NP (NN vision)))))))) (. .)))
Photoreceptor cells of the retina, the rods and cones, are responsible for the capture of light and the initiation of an electrical signal to the brain in the process of 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)))) (. .)))