Small Supernumerary Marker Chromosomes (sSMC) A Guide for Human Geneticists and Clinicians / by Thomas Liehr.
Human beings normally have a total of 46 chromosomes, with each chromosome present twice, apart from the X and Y chromosomes in males. Some three million people worldwide, however, have 47 chromosomes: they have a small supernumerary marker chromosome (sSMC) in addition to the 46 normal ones. This s...
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