( Phagocytosis ( is ( followed ( by ( formation ( of ( pus ( -LRB- ( ( ( ( cellular debris ) , ) bacteria ) -RRB- ) ) ) ) ) ) ) ) )
(ROOT (S (NP (NNS Phagocytosis)) (VP (VBZ is) (VP (VBN followed) (PP (IN by) (NP (NP (NN formation)) (PP (IN of) (NP (NP (NN pus)) (PRN (-LRB- -LRB-) (NP (NP (JJ cellular) (NN debris)) (, ,) (NP (NNS bacteria))) (-RRB- -RRB-))))))))))
Phagocytosis is followed by formation of pus (cellular debris,  bacteria)
(ROOT (S (NP (NNS Phagocytosis)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (JJ cellular) (NN eating))))) (. .)))