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The concentration itself doesnt significantly impact the chemical stability or shelf life
doi: 10.1056/NEJMc2211120

Brain Res 1456 , 113 (2012)

Where blood-based biomarkers are used then assumptions are blood volume and in the case of albumin bound biomarkers the albumin concentration may be relevant
1 2 Annual Review of Biochemistry
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Structural Insights: Studying its structure aids in understanding how peptides interact with cells