 Schizosaccharomyces pombe  has been used extensively as a model organism, however it is only recently that the first prion in this organism, a copper transporter protein encoded by  ctr4,  has been conclusively demonstrated. Prions are found in a wide range of organisms and have been implicated in a number of human neurodegenerative diseases. Research into the biology of prions has been carried out mainly in the budding yeast  Saccharomyces cerevisiae,  however there are many questions still to be addressed .  Now, with the identification of the Ctr4 prion in  S. pombe,  further work in the two yeasts and comparisons of prion biology in these organisms should lead to a greater understanding of prions and their role in disease.