Comparing the two foamy domains gives a Z-score of 2.077 sigma which, although of marginal significance, supports this model.
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A comparative analysis of the foamy and ortho virus capsid structures reveals an ancient domain duplication.
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The degree of similarity between the domains ranged from less than 1 σ to over 5 σ , with the latter (highly significant) result being obtained for both a swapped (NC) and forward (CC) combination.
These values indicated a clearly significant relationship between the foamy and ortho CA structures.
T-test statistic: An alternative to the above analysis, which still remains marginally significant, is to pool the raw comparison data for all the domain comparisons and their background distributions giving now not just a single value compared to a distribution but two distributions (Fig. 9 b ).