DNA can be extracted from any tissue containing nucleated
cells, including stored tissue blocks. Tests are usually performed
on whole blood collected into EDTA anticoagulant, or buccal
samples obtained by scraping the inside of the cheek or by
mouth wash. Once extracted, frozen DNA samples can be
stored indefinitely. Samples can therefore be collected from
family members and stored for future analysis of disorders that
are currently not amenable to molecular analysis.
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