Methionine C 11

**Semantic type:** Indicator, Reagent, or Diagnostic Aid|Pharmacologic Substance

**Definition:** A synthetic amino acid radiolabeled with carbon-11. Acting as a methyl donor, methionine C 11 is incorporated into macromolecules, where it serves as a positron emission tomography (PET) imaging agent for detecting tumors with high rates of protein synthesis.

**Synonyms:** - Methionine C11