It has been proposed that membrane-associated carboxypeptidase E acts as a sorting signal for regulated secretory proteins in the trans-Golgi network of the pituitary and in secretory granules ; regulated secretory proteins are mostly hormones and neuropeptides .
PRON AUX AUX VERB SCONJ ADJ NOUN NOUN VERB ADP DET VERB NOUN ADP ADJ ADJ NOUN ADP DET ADJ NOUN ADP DET NOUN CCONJ ADP ADJ NOUN ; ADJ ADJ NOUN AUX ADV NOUN CCONJ NOUN .