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A new restriction-like endonuclease, SlaI, was found and partially purified from Streptomyces lavendulae ATCC8664. This endonuclease cleaved bacteriophage lambda DNA at only one site, and cytosine-substituted bacteriophage T4 DNA at 16 sites. The recognition sequence was determined by using SlaI fragments of cytosine-substituted bacteriophage T4 DNA. The hexanucleotide recognized by SlaI endonuclease was with the sites of cleavage as indicated by the arrows. Therefore, SlaI endonuclease was an isochizomer of XhoI endonuclease. 相似文献
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