Answer :
When proteins are translated sometimes they have a signal peptide sequence to mark them for a certain place to go.
For example, when there is no signal peptide then the cell knows to send that protein to the cytosol when there is a signal peptide on the amino acid end of the polypeptide then the signal is read by the receptor and the protein is taken to a place like the mitochondria or ER or internal signal then cell knows that protein goes to the nucleus.
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