In a fitness program, the slogan "use it or lose it" describes Reversibility.
Insulin and glucagon, are both are secreted from islets of Langerhans at the pancreas<span />
I know C they may change shape when they bind substrates
Lecithin is (organic chemistry) the principal phospholipid in animals; it is particularly abundant in egg yolks, and is extracted commercially from soy. It is also a major constituent of cell membranes, and is commonly used as a food additive (as an emulsifier). While cephalin is (biochemistry) a phospholipid found particularly in the cells of nervous tissue; it is also the primary phospholipid in bacteria.
