Bar graph showing proportion change in relative abundance of bacterial OTUs after frozen storage of NP swabs at -70°C analysed by 16S rRNA T-RFLP. The difference in relative abundance before and after frozen storage was expressed as a proportion of the relative abundance for direct analysis. Most of the 42 OTUs detected showed minimal (<0.5%) change and OTUs that had proportion change >0.5% are shown here.
Kwambana et al. BMC Clinical Pathology 2011 11:2 doi:10.1186/1472-6890-11-2