( ( ( ( ( activated ( T ( H ( , ( activated ( T CTL ) ) ) ) ) ) , ) ( activated B-cell ) ) ( -LRB- ( ( ( ( low level ) ( of expression ) ) ( on B-cell ) ) -RRB- ) ) ) ; )
(ROOT (NP (NP (NNP activated) (NNP T) (NNP H) (, ,) (NNP activated) (NNP T) (NNP CTL)) (, ,) (NP (NNP activated) (NNP B-cell)) (PRN (-LRB- -LRB-) (NP (NP (JJ low) (NN level)) (PP (IN of) (NP (NN expression))) (PP (IN on) (NP (NNP B-cell)))) (-RRB- -RRB-)) (: ;)))
activated T H , activated T CTL , activated B-cell (low level of expression on B-cell);
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN cell)) (VP (VBZ is) (NP (NP (DT the) (JJS lowest) (NN level)) (PP (IN of) (NP (NN organism))) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB perform) (NP (NP (DT all) (NNS activities)) (VP (VBN required) (PP (IN for) (NP (NN life))))))))))) (. .)))