<Tr> <Td> AGA </Td> <Td> AGA </Td> <Td_colspan="3"> Ser (S) </Td> <Td> Arg (R) </Td> <Td> </Td> </Tr> <Tr> <Td> AGG </Td> <Td> AGG </Td> <Td_colspan="3"> Ser (S) </Td> <Td> Arg (R) </Td> <Td> </Td> </Tr> <Tr> <Td> TGA </Td> <Td> UGA </Td> <Td_colspan="3"> Trp (W) </Td> <Td> Ter (*) </Td> <Td> </Td> </Tr> <Tr> <Td> Euplotid nuclear </Td> <Td> 10 </Td> <Td> TGA </Td> <Td> UGA </Td> <Td_colspan="3"> Cys (C) </Td> <Td> Ter (*) </Td> <Td> </Td> </Tr>

How can the 4 nucleotides present in dna code for the 20 different amino acids found in proteins