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[1] Is this sequence from:

  a) pure culture: a culture that contains only one microbial species
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  b) enrichment culture: use of selective culture media to enrich for a set
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     a partially purified, mixed culture. Please do not choose this option
     for purified strains.
or
  c) bulk environmental DNA: PCR-amplified directly from source/host DNA
     using:
  i) universal primers
or
ii) species-specific primers
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