uge5 gene is the most highly expressed of the three epimerase genes in A. fumigatus, whereas uge4 mRNA expression is barely detectable. Strain Af293 was grown in Brian medium for 18 h, and the levels of uge3, uge4, and uge5 mRNA were measured by real time RT-PCR. *, indicates significantly different expression as compared with tef1 reference gene (22).