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Phenylalanine

Type of α-amino acid

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General referenceInterpretive dossier study · Crown Archives visual atlas
Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionSep 22, 2026
Entity authoritySource title only
Source-derived summary

Phenylalanine is an α-amino acid with the formula C9H11NO2. It is one of the four aromatic amino acids and the 21 proteinogenic amino acids common to all known life forms. It is also one of the nine essential amino acids. This means that humans and other animals cannot biosynthesize phenylalanine, so they must obtain it from dietary sources such as meat, dairy, eggs, and legumes. Phenylalanine is found naturally in the milk of mammals. It is used in the manufacture of food and drink products and sold as a nutritional supplement as it is a direct precursor to the neuromodulator phenethylamine.

Editorial summary

“Phenylalanine” enters the record as type of α-amino acid. Crown Archives preserves that source wording while asking what Phenylalanine, Type and α-amino can confirm, complicate or overturn.

Editorial reviewA practical starting point whose main value is the path it opens into stronger specialist and primary sources. The current 101-word lead offers orientation but no explicit four-digit date, so chronology should not be assumed. The selected authority fields contribute no independent date. Its strongest next move is a source search built around Phenylalanine, Type and α-amino.
Editorial analysis

Why this record matters

“Phenylalanine” is worth following because a concise public description often conceals a longer documentary argument. Here, Phenylalanine, Type and α-amino provides the most credible route into that argument.

Evidence profile

Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 22, 2026.

Critical limits

A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

How to read it

Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

Best used for
  • Subject orientation
  • Search vocabulary
  • Locating named sources
Verify next

The closest primary source, responsible institution and strongest cited specialist reference.

Three-step research path

  1. Establish the record: confirm the title “Phenylalanine”, its source revision and the description used here.
  2. Expand the search: follow Phenylalanine primary sources, Phenylalanine archive and Phenylalanine research across catalogues and specialist indexes.
  3. Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.

Questions for further research

  1. Which source most directly establishes the central claim about “Phenylalanine”?
  2. Which cited source is closest to the event, object or claim?
  3. Which institution is responsible for the underlying evidence?
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Source & attribution

This entry incorporates text from “Phenylalanine” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.