"Cell potency" is a cell's ability to differentiate into other cell types. A cell that is able to differentiate into many cell types is known as "pluripotent". Such cells are called stem cells in animals and meristematic cells in higher plants. A cell that is able to differentiate into all cell types is known as "totipotent". In mammals, only the zygote and early embryonic cells are totipotent, while in plants many differentiated cells can become totipotent with simple laboratory techniques.