In the early 1930's William Rose fed laboratory rats a mixture of all 19 amino acids known to be present in proteins.He observed that his rats lost weight.This observation led to the discovery of ______ as the 20th amino acid found in proteins.

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Threonine (Thr) was discovered as the 20th amino acid found in proteins due to the observation that rats lost weight when fed a diet lacking this essential amino acid, highlighting its necessity for proper nutrition and growth.

In the Early 1930's William Rose Fed Laboratory Rats a Mixture