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Three triplet bases of stop signal: UAA, UAG, UGA .
marking the end of a genetic code.
Genetic massages begin with the mRNA codon AUG, which signals the protein- synthesizing machinery to begin translating the mRNA at the location.
Three of 64 codons function as stop signal or termination codon. They are UAA, UAG and UGA . Any one of these termination codons marks the end of a genetic massage, and the completed polypeptide chain is released from the ribosome.