KaryoDraw

Ring chromosome 13

46,XY,r(13)(p11q34)

Also known as: r(13), ring 13

46,XY,r(13)(p11q34) is a ring chromosome 13, formed when both arms of chromosome 13 break and the broken ends fuse into a circle. Ring chromosomes are unstable through cell division.

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Ring fusion point: the broken chromosome ends joined here
r(13)
13
Ring chromosome 13 (46,XY,r(13)(p11q34)) drawn by KaryoDraw, showing the involved chromosomes with their normal homolog.

What the notation means

46
total chromosome count (the normal human number)
XY
sex chromosomes: one X, one Y (usual male karyotype)
r(13)(p11q34)
a RING chromosome r(13): the chromosome's arms break and the broken ends fuse into a circle (usually loses the distal tips)

Related karyotypes

KaryoDraw is a free ISCN 2024 karyotype visualizer, a StudyRare tool. It is an educational visualizer of cytogenetic nomenclature, not a diagnostic tool.