(S (S (SBAR (WHADVP (WRB When)) (S (NP (BASENP (DT the) (NN vaccine)) (VP (VBG containing) (BASENP (DT these) (NNS genes)))) (VP (VBZ is) (VP (VBN injected) (PP (IN into) (BASENP (DT the) (NN body))))))) (COMMA ,) (S (BASENP (PRP it)) (VP (VBZ is) (VP (VBN hoped) (SBAR (IN that) (S (NP (BASENP (DT the) (NN body) (POS 's)) (BASENP (JJ immune) (NN system))) (VP (MD will) (VP (VP (VB learn) (S (VP (TO to) (VP (VP (VB recognize) (CC and) (VB kill)) (NP (BASENP (NNS cells)) (SBAR (WHNP (WDT that)) (S (VP (VBP contain) (BASENP (DT the) (NN vaccine)))))))))) (COMMA ,) (S (ADVP (RB thereby)) (VP (ADVP (RB also)) (VP (VBG developing) (NP (BASENP (DT an) (JJ immune) (NN response)) (PP (IN against) (NP (BASENP (DT the) (NN HIV) (NN virus)) (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (ADVP (RB also)) (VP (VBZ contains) (BASENP (DT these) (NN three) (NNS genes)))))))))))))))))))) (PERIOD .))