Transplacement of Deletions into Yeast
The deletion plasmids made in vitro were next used to replace
the chromosomal copy-I and copy-II loci in vivo. The
plasmids were transformed into the diploid strain YP3 so that
the deletion would be complemented if copies of both sets
of H3-H4 loci were essential for viability. The histone deletions
were shuttled into the genome as described in Materials
and Methods.