Changes

==Dietary Sources==

==Dietary Sources==

Methionine and cysteine are found in highest concentrations in '''animal proteins''' (e.g., muscle, organ meats, and eggs), and are present but at much lower levels in dairy (e.g., casein), cereal grains, and pulses (i.e., legumes). Methionine and cysteine are often the most limiting amino acid in natural protein sources and are frequently supplemented into commercially-prepared dog and cat foods. Diets containing poorly digestible proteins may be inadequate to supply methionine and cysteine despite having adequate total crude protein levels<ref name="Torres"/>.

Methionine and cysteine are found in highest concentrations in '''animal proteins''' (e.g. muscle, organ meats, and eggs), and are present but at much lower levels in dairy (e.g. casein), cereal grains, and pulses (i.e. legumes). Methionine and cysteine are often the most limiting amino acid in natural protein sources and are frequently supplemented into commercially-prepared dog and cat foods. Diets containing poorly digestible proteins may be inadequate to supply methionine and cysteine despite having adequate total crude protein levels<ref name="Torres"/>.

==Diagnosing Methionine and Cysteine Deficiency==

==Diagnosing Methionine and Cysteine Deficiency==