Prolonged storage of sera at -20 degrees C did not significantly affect anti-Candida precipitin titers measured by counterimmunoelectrophoresis when compared with the original determinations.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC273222PMC
http://dx.doi.org/10.1128/jcm.10.4.593-594.1979DOI Listing

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