Name	Info	Provider	Link
	subscription/membership/fee required	Nature Publishing Group	https://doi.org/10.1038/ismej.2011.64
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21654849/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/21654849
SILVA SSU Database	free resource	SILVA	http://www.arb-silva.de/search/show/ssu/pubid/21654849
	free resource	Silverchair Information Systems	https://academic.oup.com/ismej/article-lookup/doi/10.1038/ismej.2011.64