http://en.wikipedia.org/wiki/Protein_(nutrient)
Essential amino acids include leucine, isoleucine, valine, lysine, threonine, tryptophan, methionine, phenylalanine, andhistidine. Non-essential amino acids include alanine, asparagine, aspartic acid, and glutamic acid. Conditional amino acids include arginine, cysteine, glutamine, glycine, proline, serine, and tyrosine.[3]
The foods richest in essential amino acids are those from animal sources such as meats, dairy products, fish and eggs.
Although lower in essential amino acids, plant sources also contain protein: whole grains, pulses, legumes, soy, fruits, nuts and seeds. Vegetarians and vegans can get enough essential amino acids by eating a variety of plant proteins.
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