Electron photomicrographs of the effect of L. salivarius subsp. salivarius CRL 1328 bacteriocin-like substance on E. faecalis. The Enterococcus control cell (A), vesiculization of protoplasm (B), vesiculization of protoplasm and a damaged cell wall (C), pore formation in the cell wall (D), a disintegrated cell with loss of the protoplasmic material through a cell wall pore (E), and a disintegrated cell (F) are shown. The method is described in the text.