( ( ( The process ) ( occurring ( at ( the ( axon terminal ) ) ) ) ) ( ( is ( ( exocytosis , ) ( which ( ( a cell ) ( uses ( to ( ( ( exude ( secretory vesicles ) ) out ) ( of ( the ( cell membrane ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN process)) (VP (VBG occurring) (PP (IN at) (NP (DT the) (NN axon) (NN terminal))))) (VP (VBZ is) (NP (NP (NNS exocytosis)) (, ,) (SBAR (WHNP (WDT which)) (S (NP (DT a) (NN cell)) (VP (VBZ uses) (S (VP (TO to) (VP (VB exude) (NP (JJ secretory) (NNS vesicles)) (PRT (RP out)) (PP (IN of) (NP (DT the) (NN cell) (NN membrane))))))))))) (. .)))
The process occurring at the axon terminal is exocytosis, which a cell uses to exude secretory vesicles out of the cell membrane.
(ROOT (S (NP (DT The) (NN cell)) (VP (VBZ expels) (NP (NN waste) (CC and) (JJ other) (NNS particles)) (PP (IN through) (NP (NP (DT a) (NN process)) (VP (VBN called) (NP (NNS exocytosis)))))) (. .)))