Another family of long moderately repetitive and dispersed sequences has been identified in the mouse genome. These sequences have a transposon-like structure. A 6-kilobase RNA transcript is detected in undifferentiated embryonal carcinoma cell lines but not in any of the differentiated cell types tested. By R-loop formation, the RNA is colinear with a DNA fragment from a randomly selected genomic clone.
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Brûlet et al. (1983) studied this question.
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