Divergence and redundancy of 16S rRNA sequences in genomes with multiple rrn operons by Silvia G. Acinas and others (2004)

Journal of Bacteriology186(9),2629–2635(2004); primary records pubmed.ncbi.nlm.nih.gov/15090503/ and pmc.ncbi.nlm.nih.gov/articles/PMC387781/ . Verified primary byline Silvia G. Acinas. Abstract/Introduction: copy-number variation and intragenomic sequence divergence among16S genes. Invented one-copy/four-copy example is not a reported dataset.