Expression Profile of Genes in the <i>MAT</i> Locus Is Similar between <b>a</b> and α

<p>RNA from strain XL304α and XL187<b>a</b> cultured on V8 medium for 24 h was hybridized against each other on a 70-mer genome array after labeling with fluorescent dyes. The expression level was normalized across the genome, and the average of three independent replicates for the genes in the <i>MAT</i> locus that are on the array is shown. The <b>a</b> alleles are indicated as open bars and the α alleles as solid bars. Because of the high conservation between the <b>a</b> and α alleles for the <i>ETF1</i> and <i>MYO2</i> genes, instead of separate expression levels for each allele, the expression ratio of the two alleles is used and indicated as hatched bars. Because the ratio of <i>ETF1</i> and <i>MYO2</i> is close to 1, it indicates that the two are expressed at equivalent levels in the two cell types.