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Chlorophyll is what makes some plants (and cyanobacteria) green. There are several different pigment proteins with the name chlorophyll, but they're all functionally similar. It is essential to photosynthesis. Chlorophyll is usually located in the chloroplasts.
The counterclaim to chlorophyll-woo is an old ditty (made in reference to the supposed breath-freshening properties of a certain chewing gum)
- The goat that lives on yonder hill
- Lives all day on chlorophyll