1 e-Xtra* Nostoc talks back: Temporal patterns of differential gene expression during establishment of the Anthoceros-Nostoc symbiosis Poulami Chatterjee, 1* Peter Schafran, 2,3 Fay-Wei Li, 2,3 John C Meeks 1* 1 Department of Microbiology and Molecular Genetics, University of California, Davis, CA USA 95616 2 Boyce Thompson Institute, Ithaca, NY, USA 14853 3 Plant Biology Section, Cornell University, Ithaca, NY, USA 14953 *Correspondence: Poulami Chatterjee Tel number: +1 (530) 220 0584 *pchatterjee@ucdavis.edu John C Meeks Tel number: +1 (530) 752 3346 *jcmeeks@ucdavis.edu Funding: Supported by the USA National Science Foundation grants no. DEB1831552 to JCM and DEB1831428 to FWL *The e-Xtra logo stands for “electronic extra” and indicates that supplemental materials and supplementary files are published online. The authors declare no conflict of interest. Page 1 of 67