Our ostensible ‘true negatives’ may well have exhibited shared genetic architecture within the MHC but not to an extent, within or without the MHC, sufficient to induce a nominally significant genetic correlation.
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Accurate detection of shared genetic architecture from GWAS summary statistics in the small-sample context.
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The sentences
We performed tests with and without the inclusion of the major histocompatibility complex (MHC), a gene-rich locus which frequently exhibits highly significant association signals in GWAS of immune diseases [ 51 ].