A signal peptide is a short amino acid sequence located at the N-terminus of a nascent protein that directs the protein to its appropriate cellular location, typically for secretion or insertion into membranes. This sequence acts as a postal address for proteins, ensuring that they reach the correct compartment within the cell or are secreted outside the cell. Signal peptides are crucial in the processes of protein targeting and modification, guiding proteins through the endoplasmic reticulum and Golgi apparatus.
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