( ( ( ( ( ( The discovery ) ( of ( this ( plastid-like organelle ) ) ) ) , ) ( now ( referred ( to ( as ( the apicoplast ) ) ) ) ) ) , ) ( ( ( followed ( the realisation ) ) ( that ( ( the ( 35 ( kb ( circular DNA ) ) ) ) ( is ( homologous ( to ( ( plastid genomes ) ( of ( ( photosynthetic organisms ) ( -LRB- ( ( ( ( Refs 14 ) , ) 15 ) -RRB- ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN discovery)) (PP (IN of) (NP (DT this) (JJ plastid-like) (NN organelle))) (, ,) (VP (ADVP (RB now)) (VBN referred) (PP (TO to) (NP (RB as) (DT the) (NN apicoplast)))) (, ,)) (VP (VBD followed) (NP (DT the) (NN realisation)) (SBAR (IN that) (S (NP (DT the) (CD 35) (NN kb) (NN circular) (NN DNA)) (VP (VBZ is) (ADJP (JJ homologous) (PP (TO to) (NP (NP (JJ plastid) (NNS genomes)) (PP (IN of) (NP (NP (JJ photosynthetic) (NNS organisms)) (PRN (-LRB- -LRB-) (NP (NNP Refs) (CD 14)) (, ,) (NP (CD 15)) (-RRB- -RRB-))))))))))) (. .)))
The discovery of this plastid-like organelle, now referred to as the apicoplast, followed the realisation that the 35 kb circular DNA is homologous to plastid genomes of photosynthetic organisms (Refs 14 , 15 ).
(ROOT (S (PP (IN Like) (NP (NN mitochondria))) (, ,) (NP (NNS plastids)) (VP (VBP contain) (NP (PRP$ their) (JJ own) (NN dna))) (. .)))