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The present study shows that the C4 system as investigated by high voltage agarose gel electrophoresis is highly polymorphic. In a series of unrelated Norwegian adults, where C4 types have been ascertained through segregation in families, six different haplotypes have been found to occur with a frequency exceeding 1%. The genotype frequencies in the population fit expected Hardy-Weinberg distribution. In family material comprising 89 matings with 327 children the distribution of offspring is as expected according to autosomal codominant inheritance of haplotypes. [ABSTRACT FROM AUTHOR]