Plants have evolved sophisticated weaponry to battle bacterial and fungal invaders. Researchers have figured out that plants have two major protection strategies. The first response is an array of molecules that recognize and suppress alien organisms. The second strategy involves a sequence of arms-race operatives against pathogens that outwit the first responders. Researchers began to discover that plants contain a number of other receptors that recognize common features of invading microorganisms. These features include a component of bacterial flagella, the protein motors that many bacteria use to swim around, and chitin, a long-chain polymer of N-acetylglucosamine that is found in the cell walls of many fungi. The plant immunity community named the components of invading microorganisms that could activate these plant receptors MAMPs (microbe-associated molecular patterns) and PAMPs pathogen associated molecular patterns). Plants are capable of suppressing the growth of many microorganisms with the innate immune system primed.