As a result of projects aiming to identify and characterise the genes responsible for classic and variants of late infantile NCL it became apparent that all families of Turkish origin showed recombination at both CLN2 and CLN6. These families are thought to represent a distinct genetic locus which has been designated CLN7. A number of children with late infantile onset NCL are known both in Turkey and in Turkish families now living outside of Turkey, but the exact incidence is unknown.
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