Karyotype analysis of C. neoformans var. neoformans strains. Chromosomes from the aA strains 125.91, KNA14, KN99-5a, and KN99a and the αA strains 8-1, H99, and KN99α were separated by PFGE, and the gel was stained with ethidium bromide. Size markers are based on S. cerevisiae chromosomes.