Indeed , USA-derived PC2 was found to act synergistically with PC4 in reproducing the function of intact USA in the assay system .
indeed , usa-derived pc2 was found to act synergistically with pc4 in reproducing the function of intact usa in the assay system .
O O B-protein_molecule I-protein_molecule O O O O O O B-protein_molecule O O O O O O B-cell_component O O B-other_name I-other_name O