Figure 3
From: Antitumor activity of colloidal silver on MCF-7 human breast cancer cells
MCF-7 cells stained by the TUNEL technique, counterstained with methyl green. (a) MCF-7 control, showing few brown staining of cells (arrows). (b) MCF-7 treated with colloidal silver LD50 (c) and LD100 showing abundant brown staining of cells (arrows). Original magnifications, a, b, and c: 40 ×.