TEM images of (a) FeCo MNPs, (b) negatively stained T7 phage particles, (c) positively stained biotinylated phage bound to streptavidin-coated FeCo MNPs, (e) antibody-conjugated MNPs attached on the surface of bacterial cells, (f) phage-modified magnetic nanoprobes attached on the surface of bacterial cells. (g) Comparison the capture efficiency between antibody- and phage-conjugated magnetic nanoprobes. Reproduced with permission from ref. 14. Copyright 2006, Royal Society of Chemistry.