*4.17. Statistical Analysis*

Individual groups were compared using unpaired *t* test analysis. To estimate p values, all statistical analyses were interpreted in a two-tailed manner. Values of *p* < 0.05 were considered to be statistically significant. Kaplan–Meier analysis was performed for survival curves. All data is presented as means ± SEM.

**Author Contributions:** Conceptualization, R.F., A.S., T.S., C.K. and Y.G.; Methodology, R.F., A.S., R.A., M.A., S.E., A.R., A.M. (Arik Makovitzki), A.A., A.M. (Avishai Mimran), T.S., C.K. and Y.G.; Investigation, R.F., A.S., T.S., C.K. and Y.G.; Resources: R.A., M.A. and S.E.; Writing-Original Draft Preparation, R.F., A.S., T.S., C.K. and Y.G.; Visualization: R.F. and Y.G.; Project Administration, T.S., C.K. and Y.G.

**Funding:** This study was supported by Israel Institute for Biological Research self-funding.

**Acknowledgments:** We thank Eytan Elhanany for contributing to the development of the monomerized ricin vaccine preparation; Noa Caspi and Mickey Asraf for the maintenance of the horses and Moshe Mantzur and Avi Oscar for technical support.

**Conflicts of Interest:** The authors declare no conflict of interest.
