( ( Another example ) ( ( ( ( is ( ( ( the relation ) - ) ( ( ship ( between ( ( termites and ) ( certain protists ) ) ) ) ( that ( ( ( inhabit ( their ( digestive tracts ) ) ) and ) ( are ( responsible ( for ( the break ) ) ) ) ) ) ) ) ) - ) ( down ( of ( cellulose ( into ( compounds ( that ( can ( be ( assimilated ( by ( their ( insect hosts ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT Another) (NN example)) (VP (VBZ is) (NP (NP (DT the) (NN relation)) (: -) (NP (NP (NN ship)) (PP (IN between) (NP (NP (NNS termites)) (CC and) (NP (JJ certain) (NNS protists)))) (SBAR (WHNP (WDT that)) (S (VP (VP (VBP inhabit) (NP (PRP$ their) (JJ digestive) (NNS tracts))) (CC and) (VP (VBP are) (ADJP (JJ responsible) (PP (IN for) (NP (DT the) (NN break)))))))))) (: -) (ADVP (RB down) (PP (IN of) (NP (NP (NN cellulose)) (PP (IN into) (NP (NP (NNS compounds)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB be) (VP (VBN assimilated) (PP (IN by) (NP (PRP$ their) (JJ insect) (NNS hosts)))))))))))))) (. .)))
Another example is the relation- ship between termites and certain protists that inhabit their digestive tracts and are responsible for the break- down of cellulose into compounds that can be assimilated by their insect hosts.
(ROOT (S (NP (JJ Certain) (JJ anaerobic) (JJ parabasalid) (NNS species)) (VP (VBP exist) (PP (IN in) (NP (NP (DT the) (JJ digestive) (NNS tracts)) (PP (IN of) (NP (NP (NNS termites)) (CC and) (NP (JJ wood-eating) (NNS cockroaches)))))) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (PRP they)) (VP (VBP contribute) (NP (NP (DT an) (JJ essential) (NN step)) (PP (IN in) (NP (NP (DT the) (NN digestion)) (PP (IN of) (NP (NN cellulose)))))))))) (. .)))