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These are specified │ │ by 64 possible codons (combinations of three nucleotides from four bases), │ │ with most amino acids encoded by more than one codon (a property called │ │ degeneracy). Methionine and tryptophan are the only amino acids specified by │ │ a single codon each. Three codons serve as stop signals rather than encoding │ │ amino acids. Beyond the standard 20, two additional amino │ │ acids—selenocysteine (the 21st) and pyrrolysine (the 22nd)—are also │ │ genetically encoded in certain organisms via reprogramming of stop codons │ │ UGA and UAG, respectively, but are not part of the standard set of 20. │ ╰──────────────────────────────────────────────────────────────────────────────╯ Citations ┏━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┓ ┃ # ┃ Title / Locator ┃ Excerpt ┃ Conf ┃ ┡━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━┩ │ 1 │ The genetic code (article) - │ Most of the amino acids in the │ 0.95 │ │ │ Khan Academy │ genetic code are encoded by at │ │ │ │ https://www.khanacademy.org/s │ least two codons. In fact, │ │ │ │ cience/hs-bio/x230b3ff252126b │ methionine and tryptophan are │ │ │ │ b6:gene-expression-and-regula │ the only amino acids specified │ │ │ │ tion/x230b3ff252126bb6:untitl │ by a single codon. │ │ │ │ ed-348/a/the-genetic-code │ │ │ ├─────┼───────────────────────────────┼────────────────────────────────┼───────┤ │ 2 │ Is there a twenty third amino │ The universal genetic code │ 0.98 │ │ │ acid in the genetic code? - │ includes 20 common amino │ │ │ │ PubMed │ acids. In addition, │ │ │ │ https://pubmed.ncbi.nlm.nih.g │ selenocysteine (Sec) and │ │ │ │ ov/16713651/ │ pyrrolysine (Pyl), known as │ │ │ │ │ the twenty first and twenty │ │ │ │ │ second amino acids, are │ │ │ │ │ encoded by UGA and UAG, │ │ │ │ │ respectively, which are the │ │ │ │ │ codons that usually function │ │ │ │ │ as stop signals. │ │ ├─────┼───────────────────────────────┼────────────────────────────────┼───────┤ │ 3 │ Genetic code - Wikipedia │ The genetic code is highly │ 0.95 │ │ │ https://en.wikipedia.org/wiki │ similar among all organisms │ │ │ │ /Genetic_code │ and can be expressed in a │ │ │ │ │ simple table with 64 entries. │ │ │ │ │ The codons specify which amino │ │ │ │ │ acid will be added next during │ │ │ │ │ protein biosynthesis. │ │ ├─────┼───────────────────────────────┼────────────────────────────────┼───────┤ │ 4 │ Understanding the Genetic │ The universal │ 0.97 │ │ │ Code - PMC │ triple-nucleotide genetic │ │ │ │ https://pmc.ncbi.nlm.nih.gov/ │ code, allowing DNA-encoded │ │ │ │ articles/PMC6620406/ │ mRNA to be translated into the │ │ │ │ │ amino acid sequences of │ │ │ │ │ proteins using transfer RNAs │ │ │ │ │ (tRNAs) and many accessory and │ │ │ │ │ modification factors, is │ │ │ │ │ essentially common to all │ │ │ │ │ living organisms on Earth. │ │ └─────┴───────────────────────────────┴────────────────────────────────┴───────┘ Gaps ┏━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓ ┃ Category ┃ Topic ┃ Detail ┃ ┡━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩ │ scope_exceeded │ Exact codon-to-amino-acid │ The full detailed codon │ │ │ mapping table │ table listing all 64 codons │ │ │ │ and their corresponding │ │ │ │ amino acids was not │ │ │ │ extracted verbatim from the │ │ │ │ sources, though the total │ │ │ │ count of 20 standard amino │ │ │ │ acids is well established. │ └────────────────┴──────────────────────────────┴──────────────────────────────┘ Discovery Events ┏━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓ ┃ ┃ Suggested ┃ ┃ ┃ ┃ Type ┃ Researcher ┃ Query ┃ Reason ┃ ┡━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩ │ related_research │ database │ selenocysteine │ The PubMed source │ │ │ │ pyrrolysine │ raises the │ │ │ │ genetic code │ question of │ │ │ │ expansion │ expanded genetic │ │ │ │ organisms │ codes beyond 20 │ │ │ │ │ amino acids, │ │ │ │ │ which may be │ │ │ │ │ relevant for │ │ │ │ │ advanced biology │ │ │ │ │ research. │ ├──────────────────┼───────────────────┼───────────────────┼───────────────────┤ │ related_research │ arxiv │ synthetic biology │ Wikipedia │ │ │ │ unnatural amino │ mentions expanded │ │ │ │ acids expanded │ genetic codes in │ │ │ │ genetic code │ synthetic │ │ │ │ │ biology, │ │ │ │ │ suggesting active │ │ │ │ │ research into │ │ │ │ │ adding more than │ │ │ │ │ 22 amino acids. │ └──────────────────┴───────────────────┴───────────────────┴───────────────────┘ Open Questions ┏━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓ ┃ Priority ┃ Question ┃ Context ┃ ┡━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩ │ medium │ Could a 23rd amino acid ever │ A PubMed study scanned 16 │ │ │ become widely distributed and │ archaeal and 130 bacterial │ │ │ genetically encoded in nature? │ genomes for tRNAs corresponding │ │ │ │ to the three stop codons and │ │ │ │ concluded that additional │ │ │ │ widely distributed genetically │ │ │ │ encoded amino acids are │ │ │ │ unlikely. │ ├──────────┼─────────────────────────────────┼─────────────────────────────────┤ │ low │ How many non-standard amino │ Wikipedia references expanded │ │ │ acids have been successfully │ genetic codes in synthetic │ │ │ incorporated into proteins via │ biology as a distinct topic, │ │ │ synthetic biology methods? │ suggesting │ │ │ │ laboratory-engineered codes may │ │ │ │ go beyond the natural 22. │ └──────────┴─────────────────────────────────┴─────────────────────────────────┘ ╭───────────────────────────────── Confidence ─────────────────────────────────╮ │ Overall: 0.98 │ │ Corroborating sources: 4 │ │ Source authority: high │ │ Contradiction detected: False │ │ Query specificity match: 1.00 │ │ Budget status: under cap │ │ Recency: current │ ╰──────────────────────────────────────────────────────────────────────────────╯ ╭──────────────────────────────────── Cost ────────────────────────────────────╮ │ Tokens: 48308 │ │ Iterations: 4 │ │ Wall time: 63.06s │ │ Model: claude-sonnet-4-6 │ ╰──────────────────────────────────────────────────────────────────────────────╯ trace_id: 7561029e-5dcb-4eaa-98e9-7496ed4bf4c2