<prompt> The common feature of Nuclear Localization Signals isThey are rich in acidic amino acid residues and are located at the C-terminus of the proteinThey are rich in basic amino acid residues and are located at the C-terminus of the proteinThey are rich in acidic amino acid residues and may be located anywhere in the protein sequenceThey are rich in basic amino acid residues and may be located anywhere in the protein sequence  <response>: Many nuclear proteins contain NLSs that are rich in basic arginine and lysine residues, which may be located anywhere in the polypeptide chain. Reference: Harper; 30th edition 