These cells convert light into an electrical signal that travels to the brain via the optic nerve.

Cells convert pyruvate into lactate as part of the metabolic processes that produce energy and the building blocks for making new cells.

The systems cells convert the protoporphyrin into unconjugated bilirubin that passes through the circulatory system bound to protein, particularly albumin.

Solar photovoltaic cells convert sunlight into electricity and many solar photovoltaic power stations have been built.

Endothelial cells convert preproendothelin to proendothelin and subsequently to mature endothelin, which the cells release.