1. The Xiphophorus Genetic Stock Center 1 , Department of Chemistry and Biochemistry , , San Marcos, TX 78666 , USA
2. Texas State University 1 , Department of Chemistry and Biochemistry , , San Marcos, TX 78666 , USA
3. Theodor-Boveri Institute, Biocenter, University of Würzburg 2 Developmental Biochemistry , , Würzburg 97074 , Germany