Before revision:  We conclude with a brief biological interpretation of the inherent geometric properties of multistationarity  .
After revision:  We conclude with a brief biological interpretation of the inherent geometric properties of multistationarity in n-site sequential distributive phosphorylation: the complete vector of steady state ratios is determined by the steady state ratios of free enzymes and unphosphorylated protein and there exists a linear relationship between steady state ratios of phosphorylated protein .