FISH
CASES WITH UNIPARENTAL DISOMY- UPD 15 -
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There are the following three subgroups to distinguish:
maternal uniparental disomy 15 (mat UPD 15)
paternal uniparental disomy 15 (pat UPD 15)
and
unclear if maternal or paternal uniparental disomy 15 (mat or pat UPD 15)