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. 2017 May 23;45(13):e127. doi: 10.1093/nar/gkx456

Table 1. Genes exhibiting excess zeros in the GTEx tissue data.

With excess zeros Without excess zeros
Brain tissue 5555 (21.4%) 20396 (78.6%)
Skin tissue 3739 (14.3%) 22347 (85.7%)

Numbers and percentages, in parentheses, of genes are shown. Expressions of genes are considered to have excess zeros if significance test for presence of excess zeros has p-value <0.05.