Corresponding author: Thorsten Schmidt, Ph.D.; University of Tuebingen; Medical Genetics;

genes, nonredundant pathways, and a simpler nervous system.

All three authors contributed equally to this work

Tuebingen; Germany; Email: Thorsten.Schmidt@med.uni-tuebingen.de

**1. Introduction**

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**Lessons Learned About the Pathogenesis** 

Thorsten Schmidt\*#, Jana Schmidt\* and Jeannette Hübener\*

*Eberhard-Karls-University Tuebingen, Medical Genetics* 
