14-3-3 zeta is a protein that mediates signal transduction by binding to phosphoserine-containing proteins. The protein is widely expressed in various gray matter regions of the brain. Overexpression of the 14-3-3 zeta gene has been found to correlate with chemoresistance to anthracyclines and metastatis recurrence of human breast cancer. These effects are likely caused by an anti-apoptotic mechanism of 14-3-3 zeta during anthracycline treatment.