( ( ( The ( ABC model ) ) ( of ( floral ( organ development ) ) ) ) ( ( proposes ( ( ( combinatorial interaction ) ( of ( A ( , ( B ( , ( and C ) ) ) ) ) ) ) ( ( class genes ) ( whereby ( ( ( these ( three classes ) ) ( of genes ) ) ( specifies ( ( ( ( ( ( ( ( ( ( the ( four ( floral organs ) ) ) , ) sepals ) , ) petals ) , ) stamens ) , ) and ) carpels ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNP ABC) (NN model)) (PP (IN of) (NP (JJ floral) (NN organ) (NN development)))) (VP (VBZ proposes) (S (NP (NP (JJ combinatorial) (NN interaction)) (PP (IN of) (NP (NNP A) (, ,) (NNP B) (, ,) (CC and) (NNP C)))) (NP (NP (NN class) (NNS genes)) (SBAR (WHADVP (WRB whereby)) (S (NP (NP (DT these) (CD three) (NNS classes)) (PP (IN of) (NP (NNS genes)))) (VP (VBZ specifies) (NP (NP (DT the) (CD four) (JJ floral) (NNS organs)) (, ,) (NP (NNS sepals)) (, ,) (NP (NNS petals)) (, ,) (NP (NNS stamens)) (, ,) (CC and) (NP (NNS carpels))))))))) (. .)))
The ABC model of floral organ development proposes combinatorial interaction of A, B, and C class genes whereby these three classes of genes specifies the four floral organs, sepals, petals, stamens, and carpels.
(ROOT (S (S (NP (NP (NNS Sepals)) (, ,) (NP (NNS petals)) (, ,)) (VP (VBZ stamens))) (, ,) (CC and) (S (NP (NNS carpels)) (VP (VBP are) (NP (JJ floral) (NNS organs)))) (. .)))