what is the clinical importance of doing the amino acid sequence determination

Since this is not my area of expertise, I searched Google under the key words "amino acid sequence determination" to get these possible sources:

http://en.wikipedia.org/wiki/Protein_sequencing
http://scholar.google.com/scholar?q=amino+acid+sequence+determination&hl=en&client=safari&rls=en&um=1&oi=scholart

I hope this helps. Thanks for asking.