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  • Carrier: Individuals with one abnormal gene in their gene pair. These individuals do not show evidence of the disorder.
  • Chronic (or Chronically):  A situation or disease with a long duration.
  • Citrulline: An amino acid not used in protein made by the urea cycle.
  • Cofactor:  Interaction between two substances that to bring about changes.
  • Collagen: A basic component of connective tissue.
  • Coma: Unconsciousness.
  • Concentrations: The level or amount of a substance.
  • Connective Tissue:  Tissue that surrounds other tissues and organs in the body.
  • Conversion: A change from one state to another.
  • Crisis: A negative change in the physical and/or mental well-being of a person.
  • CVS: A procedure used in the first trimester of pregnancy to diagnose genetic diseases.
  • Cytoplasm: Area of the cell that most of the chemical actions occur