( ( Although ( ( the causes ) ( ( are not ) ( entirely known ) ) ) ) ( , ( scientists ( ( believe ( ( ( the ( body 's ) ) ( own ( immune system ) ) ) ( ( ( attacks and ) destroys ) ( ( insulin-producing cells ) ( in ( the pancreas ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Although) (S (NP (DT the) (NNS causes)) (VP (VBP are) (RB not) (ADJP (RB entirely) (VBN known))))) (, ,) (NP (NNS scientists)) (VP (VBP believe) (SBAR (S (NP (NP (DT the) (NN body) (POS 's)) (JJ own) (JJ immune) (NN system)) (VP (VBZ attacks) (CC and) (VBZ destroys) (NP (NP (JJ insulin-producing) (NNS cells)) (PP (IN in) (NP (DT the) (NN pancreas)))))))) (. .)))
Although the causes are not entirely known, scientists believe the body's own immune system attacks and destroys insulin-producing cells in the pancreas.
(ROOT (S (NP (DT The) (JJ immune) (NN system)) (ADVP (RB typically)) (VP (VP (VBZ recognizes)) (, ,) (VP (VBZ attacks)) (, ,) (CC and) (VP (VBZ destroys) (NP (NP (JJ foreign) (NNS cells) (CC or) (NNS substances)) (SBAR (WHNP (WDT that)) (S (VP (MD may) (VP (VB cause) (NP (NN disease))))))))) (. .)))
The immune system typically recognizes, attacks, and destroys foreign cells or substances that may cause disease.