Figure 2: (a) TEM bright-field image for the spherical iron–oxide MNPs withan average diameter of 20 nm; (b) SQUID measurement of the MNP. Thesaturation magnetization is 36 emu/g; (c) TEM images of MNP particlesmodified by streptavidin, indicating no significant particle aggregation;(d) EELS composition analysis of streptavidin labeled MNP, suggestinguniform Fe distribution across MNP particles and carbon across thestreptavidin coating.