Using affinity-purified rabbit polyclonal antibodies against an extrac
ellular mannoprotein (gp400) of Saccharomyces cerevisiae, the presence
. of immunohomologic proteins with similar electrophoretic mobility wa
s shown in the culture medium of S. bayanus, S. paradoxus and S. pasto
rianus. Cross-reactive bands with different electrophoretic behaviour
were observed for S. dairensis, S. exiguus, S. kluyveri, S. unisporus
and also for the species moved from Saccharomyces to Arxiozyma, Kluyve
romyces, Pachytichospora, Torulaspora and Zygosaccharomyces, in contra
st to ascosporous yeasts of other genera in which these proteins were
not found.