Transverse Membrane MovementsLipids don't easily diffuse across the hydrophobic regionRate of tranverse diffusion is facilitated by enzymesFlippaseLipds are flipped through the hydrophobic region by utilizing hydrophilic protein regionsFluorescence recover after photobleaching2. Smack it with a beam of light.1. Tag all lipids with GFP3. Measure the lateral mobility of bleached lipids4. These experiments prove the membrane is fluid