( ( if ( ( the antigens ) ( are ( attached ( to ( ( the surface ) ( of ( ( a cell ) ( like ( a bacterium ) ) ) ) ) ) ) ) ) ) ( , ( ( the cell ) ( too ( ( is destroyed ) . ) ) ) ) )
(ROOT (S (SBAR (IN if) (S (NP (DT the) (NNS antigens)) (VP (VBP are) (VP (VBN attached) (PP (TO to) (NP (NP (DT the) (NN surface)) (PP (IN of) (NP (NP (DT a) (NN cell)) (PP (IN like) (NP (DT a) (NN bacterium))))))))))) (, ,) (NP (DT the) (NN cell)) (ADVP (RB too)) (VP (VBZ is) (VP (VBN destroyed))) (. .)))
if the antigens are attached to the surface of a cell like a bacterium, the cell too is destroyed.
(ROOT (S (NP (DT A) (NN lysozyme)) (VP (VBZ destroys) (NP (NNS bacteria)) (PP (IN by) (S (VP (VBG digesting) (NP (PRP$ their) (NN cell) (NNS walls)))))) (. .)))