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Incidences of HERV transcripts in 105 brain RNA samples. Ubiquitously active HERVs are marked with black boxes (incidence, 33 to 35/35), and differentially active (incidence, 3 to 32/35) and inactive (incidence, 0 to 2/35) HERV elements are depicted by gray and white boxes, respectively. “-” means that the P value was not significant in Fisher's exact test.
