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Supershift with the HERV-K LTR fragment from bp 1 to 167 protein complexes with an anti-YY1-antibody. Lane 1, no protein extract added; other lanes, anti-YY1-antibody, anti-cORF-antiserum, and subfragment from bp 30 to 103 as a specific competitor were added to individual binding reactions as indicated. Except for complex T1 of both teratocarcinoma cells, all protein complexes are retarded by the anti-YY1-antibody.
