Twelve different ORFs have been deleted from the right arm of Saccharomyces
cerevisiae chromosome II; namely YBR193c, YBR194w, YBR197c, YBR198c, YBR20
1w, YBR203w, YBR207w, YBR209w, YBR210w, YBR211c, YBR217w and YBR228w. Tetra
d analysis of heterozygous deletant strains revealed that YBR193c, YBR198c
and YBR211c are essential genes for vegetative growth. No effects were dete
cted in any of the haploid deletion mutants for the rest of the ORFs with r
espect to growth, gross morphology or mating. Copyright (C) 1999 John Wiley
& Sons, Ltd.