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Saccharomyces bayanus
http://distans.livstek.lth.se:2080/S_bayan.htm
Two SEM micrographs of cells of this yeast, with a brief discussion of yeast biology.
Saccharomyces cerevisiae
http://www.dipbot.unict.it/sistematica/Saccharom.html
Microscopic image of bread yeast.