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- n. Plural form of heterocyst.
Sorry, no etymologies found.
In the higher forms special cells called heterocysts are found.
These ions can be present naturally as a result of atmospheric deposition, surface and groundwater runoff, dissolution of nitrogen-rich geological deposits, N2 fixation by certain prokaryotes (cyanobacteria with heterocysts, in particular), and biological degradation of organic matter.
We presume that in strain D9 the ability to form proper heterocysts was secondarily lost together with N
"Patterning of heterocysts controlled by gradients of activator protein in filamentous cyanobacgteria" by Doug Risser, Graduate Student, UH, Department of Microbiology