( ( In ( ( this type ) ( of PRA ) ) ) ( , ( there ( ( is ( ( a problem ) ( with ( ( the ( initial development ) ) ( of ( ( the ( ( rods and ) cones ) ) ( -LRB- ( ( ( the ( light ( receptor cells ) ) ) ( in ( the retina ) ) ) -RRB- ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (DT this) (NN type)) (PP (IN of) (NP (NNP PRA))))) (, ,) (NP (EX there)) (VP (VBZ is) (NP (NP (DT a) (NN problem)) (PP (IN with) (NP (NP (DT the) (JJ initial) (NN development)) (PP (IN of) (NP (NP (DT the) (NNS rods) (CC and) (NNS cones)) (PRN (-LRB- -LRB-) (NP (NP (DT the) (JJ light) (NN receptor) (NNS cells)) (PP (IN in) (NP (DT the) (NN retina)))) (-RRB- -RRB-)))))))) (. .)))
In this type of PRA, there is a problem with the initial development of the rods and cones (the light receptor cells in the retina).
(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)))) (. .)))