( ( ( ( ( Autoantibodies ( ( are also ) ( proteins ( built ( by ( the body ) ) ) ) ) ) , ) but ) ( ( instead ( of ( attacking ( foreign material ) ) ) ) ( , ( they ( inappropriately ( attack ( ( the ( body 's ) ) ( own cells ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNS Autoantibodies)) (VP (VBP are) (ADVP (RB also)) (NP (NP (NNS proteins)) (VP (VBN built) (PP (IN by) (NP (DT the) (NN body))))))) (, ,) (CC but) (S (PP (RB instead) (IN of) (S (VP (VBG attacking) (NP (JJ foreign) (NN material))))) (, ,) (NP (PRP they)) (ADVP (RB inappropriately)) (VP (VBP attack) (NP (NP (DT the) (NN body) (POS 's)) (JJ own) (NNS cells)))) (. .)))
Autoantibodies are also proteins built by the body, but instead of attacking foreign material, they inappropriately attack the body's own cells.
(ROOT (S (NP (NNP Autoantibody)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (DT an) (NN antibody)) (SBAR (WHNP (WDT that)) (S (ADVP (RB inappropriately)) (VP (VBZ marks) (S (NP (NNS self-components)) (ADJP (RB as) (JJ foreign)))))))))) (. .)))