8:30 AM. 399. Tunable Magnetorheological Elastomer Substrates for Studying Mechano-Genetic Interactions in Hypertrophic Cardiomyopathy.Yasaman Kargar Gaz Kooh1, Yuwen Sun1, Bahareh Bahman1, Ganesh Malayath1, Leah Hayem1, Debeni Devi Nongmaithem1, Guy Genin1, Nathaniel Huebsch1 1Washington University in St. Louis