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Phylogenetic location of the wild Nis+ Lactococcus lactis strains M78 and M104 among closely related species of bacteria based on the lactate dehydrogenase (ldh) gene sequence. The scale bar indicates 0.05 substitutions per nucleotide position. S. uberis, Streptococcus uberis; S. pyogenes, Streptococcus pyogenes.
