Streptococci and Lactococci possess alternative Xer site-specific recombination machinery, phylogenetically unrelated to the classical XerCD/dif system, to resolve chromosome dimers (see Le Bourgeois et al.). The image shows epifluorescence microscopy of a Lactococcus lactis xerS mutant (kindly provided by Søren M. Madsen, Denmark), after staining with the LIVE/DEAD BacLight Viability Kit (Molecular Probes).
Image Credit: Photograph by Pascal Le Bourgeois.
Review
Genetic Determinants of Human Health Span and Life Span: Progress and New Opportunities
PLOS Genetics: published July 27, 2007 | https://doi.org/10.1371/journal.pgen.0030125
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