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. 2012 Jan 9;109(14):E851–E859. doi: 10.1073/pnas.1105543109

Fig. 3.

Fig. 3.

The magnitude of the observed cross-twin cross-trait (FA and transferrin) correlations are higher in identical than fraternal twin pairs, supporting our hypothesis that partially overlapping sets of genes may explain some of the shared variance in brain structure and transferrin levels. This motivates the use of bivariate ACE modeling to estimate the degree of shared genetic influence.