1 Biodiversity Research Centre, Department of Botany, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
2 Biodiversity Research Centre, Department of Botany, University of British Columbia, Vancouver, BC V6T 1Z4, Canada. Electronic address: naomi.fast@ubc.ca.
In this Quick guide, Thomas Whelan and Naomi Fast introduce the microsporidia: obligate intracellular parasites with the most extremely reduced genomes known in eukaryotes.