Based on genetic analyses, these isolates were prototrophic and homothallic, with dominant homothallic and thermotolerant phenotypes.After short-term (30 min) and long-term (12 h) exposure at 37C, expression levels increased for the heat stressresponse genes HSP26, SSA4, HSP82, and HSP104 encoding the heat shock proteins small HSP, HSP70, HSP90 and theHSP100 family, respectively.