TGF-β is secreted by many cell types , including macrophages , in a latent form in which it is complexed with two other polypeptides , latent TGF-beta binding protein ( LTBP ) and latency-associated peptide ( LAP ) .
PROPN AUX VERB ADP ADJ NOUN NOUN , VERB NOUN , ADP DET NOUN NOUN ADP DET PRON AUX VERB ADP NUM ADJ NOUN , NOUN NOUN VERB NOUN ( PROPN ) CCONJ ADJ NOUN ( PROPN ) .