( Mycoplasma ( ( ( ( ( ( ( lack ( cell walls ) ) , ) ( have ( ( ( ( highly variable ) ( surface proteins ) ) and ) ( a ( distinctive ( plasma membrane ) ) ) ) ) ) , ) and ) ( are ( the ( smallest ( self-replicating prokaryotes ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Mycoplasma)) (VP (VP (VBP lack) (NP (NN cell) (NNS walls))) (, ,) (VP (VBP have) (NP (NP (ADJP (RB highly) (JJ variable)) (NN surface) (NNS proteins)) (CC and) (NP (DT a) (JJ distinctive) (NN plasma) (NN membrane)))) (, ,) (CC and) (VP (VBP are) (NP (DT the) (JJS smallest) (JJ self-replicating) (NNS prokaryotes)))) (. .)))
Mycoplasma lack cell walls, have highly variable surface proteins and a distinctive plasma membrane, and are the smallest self-replicating prokaryotes.
(ROOT (S (NP (JJ Prokaryotic) (NNS cells)) (VP (VBP have) (NP (NP (DT a) (NN cell) (NN wall)) (PP (IN outside) (NP (PRP$ their) (NN plasma) (NN membrane))))) (. .)))