Satellite DNA sequences normally do not code for any proteins, but they form a large portion of the human genome.
Satellite DNA is separated from bulk genomic DNA as different peaks during density gradient centrifugation. The bulk DNA forms a major peak, and the other small peaks are referred to as satellite DNA.
These sequences show a high degree of polymorphism and form the basis of DNA fingerprinting.
Since the polymorphisms in the satellite DNA are inheritable from parents to children, DNA fingerprinting is the basis of paternity testing in case of disputes.