title: Absence of photosystem 2 in heterocysts of the blue-green alga Anabaena.
mesh_terms: D002454:Cell Differentiation; D002734:Chlorophyll / Q000378:metabolism; D002736:Chloroplasts / Q000378:metabolism*; D000458:Cyanobacteria / Q000166:cytology / Q000378:metabolism* / Q000528:radiation effects; D003580:Cytochromes / Q000378:metabolism; D003624:Darkness; D004579:Electron Transport; D005453:Fluorescence; D008027:Light; D010084:Oxidation-Reduction; D010100:Oxygen; D010788:Photosynthesis; D010860:Pigments, Biological / Q000378:metabolism; D011830:Radiation Effects; D013053:Spectrophotometry; D014732:Vibration
chemical_list: D003580:Cytochromes; D010860:Pigments, Biological; D002734:Chlorophyll; D010100:Oxygen