1.   The list of standard protein amino acids has been expanded from 20 to 23. H

1.   The list of standard protein amino acids has been expanded from 20 to 23. How are the extra three amino acids incorporated into proteins?
2.  What are non-standard protein amino acids? How are they incorporated into proteins?
3. What are the functions of non-protein amino acids?                                                                                                                                                                                                                                                                                                                                                                                          

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