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A form of chlorophyll found in photosynthetic bacteria, notably the purple and green bacteria. There are several types, designated a to g. For example, bacteriochlorophyll a and bacteriochlorophyll b are structurally similar to the chlorophyll a and chlorophyll b found in plants; the purple bacteria contain either of these two types of bacteriochlorophyll, depending on the species. Bacteriochlorophyll is located in specialized membrane systems (chromatophores); in purple bacteria these are in the form of sheets, tubes, or vesicles arising inside the cell from the plasma membrane, whereas in green bacteria they are cylindrical structures ( chlorosomes) underlying the plasma membrane.

Subjects: Chemistry.

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