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The start codon is the RNA string AUG, which is transcribed from the DNA string ATG. In the genetic code, the start codon corresponds to the amino acid methionine, which triggers the beginning of translation of a molecule of mRNA into protein.
A stop codon is an RNA codon that, when encountered by a ribosome during RNA translation, immediately terminates translation because there does not exist a molecule of tRNA whose anticodon will base pair with the stop codon. A stop codon is also known as a "nonsense codon" because translation terminates for the simple reason that the ribosome does not know how to proceed.
The three possible stop codons are UAG , UGA, and UAA, which are transcribed from the respective DNA codons TAG, TGA, and TAA.
UUU F CUU L AUU I GUU V
UUC F CUC L AUC I GUC V
UUA L CUA L AUA I GUA V
UUG L CUG L AUG M GUG V
UCU S CCU P ACU T GCU A
UCC S CCC P ACC T GCC A
UCA S CCA P ACA T GCA A
UCG S CCG P ACG T GCG A
UAU Y CAU H AAU N GAU D
UAC Y CAC H AAC N GAC D
UAA Stop CAA Q AAA K GAA E
UAG Stop CAG Q AAG K GAG E
UGU C CGU R AGU S GGU G
UGC C CGC R AGC S GGC G
UGA Stop CGA R AGA R GGA G
UGG W CGG R AGG R GGG G
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