What is the difference between nostoc and pencillum
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Like most blue-green algae, Nostoc contains two pigments, blue phycocyanin and red phycoerythrin, as well as chlorophyll, and has the ability to fix nitrogen in specialized cells called heterocysts. A terrestrial species has been used as a supplementary food source in Asia.
a blue mould that is common on food, being added to some cheeses and used sometimes to produce penicillin.
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