In contrast to proteins, which can have either a net positive or net negative charge, nucleic acids have a consistent negative charge imparted by their phosphate backbone, and migrate toward the anode. Proteins and nucleic acids are electrophoresed within a matrix or gel.
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Uni is also sometimes served with a raw quail egg. Uni is also considered an aphrodisiac by some. It is harvested throughout the world, however the west coast of the U.S. has in recent years become one of the largest sources, and much of the harvest finds its way overseas to eager Asian customers.