Ll proteins act via phosphorylation. discuss

An alternative title for this essay is all peptide hormones alter cell function by phosphorylation while steroid hormones act by altering gene expression. discuss. The essay would need to include hormone receptor types, signal transduction etc. Any peptide hormones that do not act via phosphorylation? Then a discussion of how steriod hormones act on intracellular receptors and how they alter cellular effects?