Before revision:  Building on earlier work in {\em Holstein et.al., 2013}, we present a scalar determining equation for multistationarity which will lead to 5 steady states for a 3-site and to 7 steady states for a 4-site phosphorylation system and hence to counterexamples to the conjecture of Wang and Sontag.
After revision:  This, however, is not true: building on earlier work in {\em Holstein et.al., 2013}, we present a scalar determining equation for multistationarity which will lead to 5 steady states for a 3-site and to 7 steady states for a 4-site phosphorylation system and hence to counterexamples to the conjecture of Wang and Sontag.