N-terminal transit sequences are also called presequences because they are located at the "front" end of a polypeptide—ribosomes synthesize polypeptides from the N-terminus to the C-terminus.
As secuencias de tránsito N-terminais tamén se chaman presecuencias porque están localizadas no extremo "dianteiro" do polipéptido (os ribosomas sintetizan os polipéptidos desde o extremo N-terminal ao C-terminal).