17 Betard Betard C C Kessling Kessling AM AM Roy Roy M M Influence of genetic variability in the nondeletion LDL-receptor allele on phenotypic variation in French-Canadian familial hypercholesterolemia heterozygotes sharing a “null” LDL-receptor gene defect Influence of genetic variability in the nondeletion LDL-receptor allele on phenotypic variation in French-Canadian familial hypercholesterolemia heterozygotes sharing a “null” LDL-receptor gene defect Atheroscler. The gene discussed is LDLR; the disease is familial hypercholesterolemia.