Abstract
A study has been made of the similarity of concentrations of IgG, IgA and IgM in twins. The results provide evidence for the genetic control of all three immunoglobulins in adolescence, but in adults genetic control was demonstrable only for IgG in males. The findings suggest that although genetic factors regulating all classes of immunoglobulin levels in adults cannot be excluded by this study, if such factors do exist their effects are relatively small or are confined to certain individuals. This conclusion suggests that immunoglobulin concentrations in healthy adults will not form useful indices of future susceptibility to genetically determined diseases of immunity.
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Selected References
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