Chlorophyll distribution in cyanobacteria can change based on available chlorophyll types. When given the gene for chlorophyll b synthesis, cyanobacteria can incorporate chlorophyll b into their photosynthetic complexes. This shows that chlorophyll-binding proteins are not picky about which chlorophyll they use. The presence of specific chlorophylls during protein synthesis determines which ones get incorporated. This flexibility allows for the evolution of different pigments and proteins independently.