Cytochrome c
Cytochrome c (Cyt) is a small soluble heme protein with a hexacoordinated heme and functions as an electron shuttle in the mitochondria and in early events of apoptosis when released to the cytoplasm...
You can find the full article of Peter Hildebrandt et al. on "Molecular Basis for the Electric Field Modulation of Cytochrome c Structure and Function": Research\Research Highlights