<unk>  is a very rare human chromosome abnormality. It occurs when one or both of the telomeres that mark the ends of chromosome<unk>  are lost allowing the now uncapped ends to fuse together forming a<unk>  chromosome. It causes a number of serious health issues.
Ring chromosome 14 syndrome
Ring chromosome 20 syndrome
Smith Martin Dodd syndrome
Kaufman oculocerebrofacial syndrome
13q deletion syndrome
2q37 deletion syndrome
22q11.2 duplication syndrome
8p23.1 duplication syndrome