Forms and Nomenclature
The term "aspartic acid" refers to either of two forms or a mixture of two. Of these two forms, only one, "-aspartic acid", is directly incorporated into proteins. The biological roles of its counterpart, "-aspartic acid" are more limited. Where enzymatic synthesis will produce one or the other, most chemical syntheses will produce both forms, "-aspartic acid," known as a racemic mixture.
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“An expense of ends to means is fate;Morganization tyrannizing over character. The menagerie, or forms and powers of the spine, is a book of fate: the bill of the bird, the skull of the snake, determines tyrannically its limits.”
—Ralph Waldo Emerson (1803–1882)