Intron-exon structure of HSP90 genes in O. europaea var. europaea (OeHSP90s) and A. thaliana (AtHSP90s). The yellow blocks indicate exons, the black lines indicate introns and the blue blocks indicated upstream or downstream. The number of exons is indicated on the right hand side. Cyt, Cytosol; Chl, Chloroplast; ER, Endoplasmic reticulum; Mit, Mitochondria; Nuc, Nucleus