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  • Title: A twin study of aryl hydrocarbon hydroxylase (AHH) inducibility in cultured lymphocytes.
    Author: Børresen AL, Berg K, Magnus P.
    Journal: Clin Genet; 1981 Apr; 19(4):281-9. PubMed ID: 6944164.
    Abstract:
    Aryl hydrocarbon hydroxylase (AHH) inducibility was studied in cultured lymphocytes from 28 monozygotic (MZ) and 19 dizygotic (DZ) twin pairs. The results indicate that the induced level of AHH activity as well as inducibility (expressed as the ratio between levels in induced and non-induced cells) are inherited. The best (h2) estimate of heritability is 0.7. There was no suggestion that non-induced AHH activity level is an inherited trait. Inducibility of AHH was not normally distributed and the distribution observed in this limited series might even be trimodal. The results of the study appear to confirm previous reports that AHH inducibility is an inherited trait, and do not exclude the possibility that the major part of the variation is controlled by one locus.
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