Keywords: CNTs; carbon nanotubes; gC1q; globular head regions of human C1q; MWNTs; multi walled CNTs; Fe-MWNTs; iron filled multi walled CNTs; SWNTs; single-walled CNT; DWNTs; double-walled CNT; Carbon nanotubes; Complement; C1q; Cytokines; Macrophage;