K. pneumoniae NTUH-K2044 (a strain that resulted in pyogenic liver abscess in a 66 year old patient) was kindly provided by Dr. Jin Town Wang of the National Taiwan University Hospital, Taipei, Taiwan [10] (link). E. coli SM10 lambda pir and pUT-Km was used to create isogenic mutants. Genomic DNA, plasmid, restriction digestion, DNA elution (Qiagen), ligation, transformation, conjugation, DNA sequencing (Applied Biosystems) were performed as previously described [22] (link), [23] (link), [24] . Primers used in the present study were custom-synthesized (Eurofins MWG operons, Germany).
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