Asignal sequence at the n-terminus of newly synthesized proteins will direct the protein to the for protein packaging.

Endoplasmic Reticulum (ER) is the word to fully understand the statement above. It is important for synthesizing, folding, modifying and transporting of proteins. The production of series of flattened sacs within the cytoplasm of eukaryotic cells is a perpetual membrane system that helps various functions.