Stability of Folate and Vitamin B12 in Human Serum after Long-Term Storage: A Follow-Up after 13 Years
Correlation between the mean folate concentrations at and after storage for 1, 8, and 13 years at −70°C. The correlation lines have the following equations: y = 0.870x + 1.02 , y = 0.703x + 3.53 , and y = 0.552x + 5.11 for 1, 8, and 13 years, respectively.
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