This Accepted Manuscript has not been copyedited and formatted. The final version may differ from this version. Research Article: New Research | Development Examining Hippocampal Mossy Fiber Synapses by 3D Electron Microscopy in Wildtype and Kirrel3 Knockout Mice 3D EM of mossy fiber synapses in Kirrel3 KO mice E. Anne Martin, Derek Woodruff, Randi L. Rawson and Megan E. Williams Department of Neurobiology and Anatomy, University of Utah School of Medicine, Salt Lake City, UT 84132 DOI: 10.1523/ENEURO.0088-17.2017 Received: 18 March 2017 Revised: 20 April 2017 Accepted: 17 May 2017 Published: 22 May 2017 Author Contributions: MEW and EAM designed research; MEW, EAM, DW, and RLR performed research; MEW and EAM analyzed data; and MEW and EAM wrote the paper. Funding: Whitehall Foundation (Whitehall Foundation, Inc.): 100001391. Alfred P. Sloan Foundation: 100000879. Edward Mallinckrodt Jr Foundation; HHS | NIH | National Institute of Mental Health (NIMH): 100000025; 1RO1MH105426. Autism Speaks (Autism Speaks Inc.): 100000073; 10116. HHS | NIH | Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD): 100009633; T32HD007491. Conflict of Interest: Authors report no conflict of interest. This work was funded by grants to MEW from the Whitehall, Alfred P Sloan, and Edward Mallinckrodt Jr Foundations, and NIH grant 1R01MH105426. EAM is funded by an Autism Speaks Dennis Weatherstone Predoctoral Fellowship (#10116) and previously by an NIH Developmental Biology Training Grant (NIH T32HD007491). Corresponding Author: Megan Williams, [email protected] Cite as: eNeuro 2017; 10.1523/ENEURO.0088-17.2017 Alerts: Sign up at eneuro.org/alerts to receive customized email alerts when the fully formatted version of this article is published. Accepted manuscripts are peer-reviewed but have not been through the copyediting, formatting, or proofreading process. 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