You only need the English Proficient for international operations as it's an ICAO thing. Some countries, like France, check; others may not. Similar on the RRTO -- some countries, like Canada and the Bahamas don't require it, but others, like Turks & Caicos, do require it and do check it.
Apoptosis, or programmed cell death, is a naturally occurring process in the body. It involves a controlled sequence of steps in which cells signal self termination. Apoptosis works to keep the body's natural cell division process of mitosis in check.
Diagram showing different responses of normal and cancer cells to conditions that would typically trigger apoptosis. 1  A normal cell with unfixable DNA damaged will undergo apoptosis. 2  A cancer cell with unfixable DNA damage will not undergo apoptosis and will instead continue dividing.