Before revision:  Specifically we identify the `smallest CFSTR atoms of multistationarity', namely those containing one non-flow reaction, which may be irreversible or reversible. We will refer to such atoms as one-reaction atoms of multistationarity. CFSTR atoms of multistationarity were introduced in the recent work of Joshi and Shiu. We recall that a fully open network (alternatively a fully open CFSTR) is a chemical reaction network where all chemical species participate in the inflow and the outflow;
After revision:  We consider the set of fully open networks, those for which all chemical species participate in the inflow and the outflow;