Just an interesting observation...there's no Phosphate in amino acids...why?
Because amino acids, by definition, don't contain a phosphate group.
However, phosphorylated amino acids play a role in analytical biochemistry as well as metabolism, cell signaling, and the like.
There are polymeric compounds that have a phosphorus-nitrogen backbone (see, for example, the work of Harry Allcock at Penn State University), but they're not phosphates.
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