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Retroviruses are commonly considered to be restricted to vertebrates. However, the genome of many eukaryotes contains mobile sequences known as retrotransposons with long terminal repeats (LTR retrotransposons) or viral retrotransposons, showing similarities with integrated proviruses of retroviruses, such as Ty elements in Saccharomyces cerevisiae,(More)
The flamenco gene, located at 20A1-3 in the beta-heterochromatin of the Drosophila X chromosome, is a major regulator of the gypsy/mdg4 endogenous retrovirus. As a first step to characterize this gene, approximately 100 kb of genomic DNA flanking a P-element-induced mutation of flamenco was isolated. This DNA is located in a sequencing gap of the Celera(More)
Bivalent or bispecific binding activity of proteins has been mainly achieved by assembling two or more domains in a single molecule. Here we report bivalent/bispecific single-domain proteins based on the kringle domain (KD), which has a cystine knot structural motif and is highly tolerant of sequence modifications. KD has seven loops protruding from the(More)
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