Support WBURThe Case For Solar EnergyUrsula GoodenoughMay 07, 2010 ShareWhen you deprive Chlamy of nitrogen, it bloats up with triacylglycerides (TAGs) until it looks like a fat-guy cartoon. Here, the red is chlorophyll fluorescence and the yellow comes from a dye that fluoresces yellow when it’s embedded in TAGs. (NPR)