( ( Adaptive ( Immune ( System &#0147; ) ) ) ( ( ( This ( helps ( explain ( why ( ( the ( jawed vertebrates ) ) ( are ( ( the ( only species ) ) ( that ( have ( ( ( ( a ( second ( , ( adaptive ( immune system ) ) ) ) ) , ) ( ( in addition ) to ) ) ( ( the ( innate ( immune system ) ) ) ( that ( ( all ( other species ) ) have ) ) ) ) ) ) ) ) ) ) ) ) ) , ) ( ( ( ( ( &#0148; Schatz ) , ) ( an immunologist ) ) , ) ( said . ) ) ) )
(ROOT (S (NP (NNP Adaptive) (NNP Immune) (NNP System) (CD &#0147;)) (PRN (S (NP (DT This)) (VP (VBZ helps) (VP (VB explain) (SBAR (WHADVP (WRB why)) (S (NP (DT the) (JJ jawed) (NNS vertebrates)) (VP (VBP are) (NP (NP (DT the) (JJ only) (NN species)) (SBAR (WHNP (WDT that)) (S (VP (VBP have) (NP (NP (DT a) (JJ second) (, ,) (JJ adaptive) (JJ immune) (NN system)) (, ,) (CONJP (IN in) (NN addition) (TO to)) (NP (NP (DT the) (JJ innate) (JJ immune) (NN system)) (SBAR (IN that) (S (NP (DT all) (JJ other) (NN species)) (VP (VBP have)))))))))))))))) (, ,)) (NP (NP (CD &#0148;) (NN Schatz)) (, ,) (NP (DT an) (NN immunologist)) (, ,)) (VP (VBD said)) (. .)))
Adaptive Immune System &#0147;This helps explain why the jawed vertebrates are the only species that have a second, adaptive immune system, in addition to the innate immune system that all other species have,&#0148; Schatz, an immunologist, said.
(ROOT (S (NP (NNS Vertebrates)) (VP (VBP are) (ADJP (JJ unique) (PP (IN in) (S (VP (VBG having) (S (NP (NP (JJ adaptive) (NN immunity)) (PP (IN in) (NP (NN addition)))) (VP (TO to) (VP (VB innate) (NP (NN immunity)))))))))) (. .)))