| During growth the number of vegetative cells is increased by cell division and the space between heterocysts becomes larger. |
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| Nitrification cannot occur in the presence of oxygen, so nitrogen is fixed in specialized cells called heterocysts. |
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| In the 1970s, purified heterocysts from this strain were used to demonstrate that they are the sites of aerobic nitrogen fixation. |
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| These heterocysts develop from vegetative cells in a regular pattern along the filament. |
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| In the case of fixed nitrogen deprivation the bacteria will produce heterocysts at regular intervals, usually around ten cells apart, along the filament. |
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| The heterocystous cyanobacteria are distinguished by the ability to fix atmospheric nitrogen in specialized cells called heterocysts. |
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| Cyanobacteria have specialized, walled-off cells called heterocysts in which nitrogen fixation is carried out. |
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| Some cyanobacterial genera can fix nitrogen in specialized cells called heterocysts, which form a monophyletic lineage. |
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