The number of amino acids that a human body cannot synthesize is ________.

Name: The number of amino acids that a human body cannot synthesize is ________.
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The human body cannot synthesize 10 out of the 20 standard amino acids, which are phenylalanine, valine, threonine, tryptophan, methionine, leucine, isoleucine, lysine, histidine, and arginine. These amino acids must be obtained from the diet, and therefore are called essential amino acids.

The Number of Amino Acids That a Human Body Cannot