It is of interest to note that a number of “Optional” regions show shared genetic covariance with each other (albeit at marginal significance levels); this is not the case for any pair of “Obligatory” regions.
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The sentences
Nonetheless, the uneven distribution of the nominally significant results between the Ambiguous (9/25) and Angry (0/25) speaks against a chance nature of these findings, as confirmed by the Monte-Carlo simulations.