Writing that could go into the manuscript at some point:
Using SIP, the known diversity of multiple microbial guilds has been extended, including methanotrophs \cite{Knief2003}, methanogens \cite{Lu_2005}, ammonia oxidisers \cite{Pratscher_2011}, diazotrophs \cite{Buckley_2007}, cellulose-degrading \cite{Pepe-Ranney2016}  and many others. SIP has also been instrumental in deciphering microbial interactions \cite{Ho2016,Murase_2007}, and soil food webs \cite{DeRito_2005}.