9:15 AM. 142. In situ rheological monitoring of diffusion-controlled hydrogel crosslinking for embedded 3D bioprinting.Audrey Shih1, Fotis Christakopoulos, PhD1, Stella Chung1, Lucia Brunel, PhD1, Noah Eckman1, Yueming Liu1, Junyi Tao2, Sarah Heilshorn, PhD1, Gerald Fuller, PhD1 1Stanford University, 2University of Tokyo