Before revision:  We propose a lattice model that roughly accounts for proteins' attraction within a layer and across the stromal gap, steric repulsion across the lumen gap, and regulation of protein densityby exchange with the stroma lamellae  Mean field analysis and computer simulation reveal rich phase behavior for this simple model, featuring a broken-symmetry stripephase that is disrupted at both high and low extremes of chemical potential.
After revision:  We propose a lattice model that roughly accounts for proteins' attraction within a layer and across the stromal gap, steric repulsion across the lumen gap, and regulation of protein density by exchange with the stroma lamellae Mean field analysis and computer simulation reveal rich phase behavior for this simple model, featuring a broken-symmetry stripephase that is disrupted at both high and low extremes of chemical potential.