Enteroendocrine cells of the intestine are the most numerous endocrine cells of the body. In a sense they are known to act as chemoreceptors, initiating digestive actions and detecting harmful substances and initiating protective responses.
The typical manufacturer's warranty on a solar panel is 25 to 30 years, but panels can last up to 40 years with care and attention.
In fact, solar panels have been used over 60 years to keep communications and exploration satellites running, and the astronauts on the International Space Station have trusted their lives to solar power for over 13 years. IN THE HARSH ENVIRONMENT OF SPACE.