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The Number of a U3 Repeat Box Acting as an Enhancer in Long Terminal Repeats of Polytropic Replication-Competent Porcine Endogenous Retroviruses Dynamically Fluctuates during Serial Virus Passages in Human Cells |
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| Authors: | Gregor Scheef Nicole Fischer Ulrich Krach and Ralf R Tnjes |
| Institution: | Paul-Ehrlich-Institut, D-63225 Langen, Germany. |
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