Hi, I have some mouse hearts in Z Fix. I am going to be out of town for the next week, can they stay in Z Fix or should I transfer them to 70%? Thanks. Betsy Molinari HT (ASCP) Texas Heart Institute Cardiovascular Pathology 6770 Bertner Ave. Houston,TX 77030 832-355-6524 832-355-6812 (fax)