However, the principles governing how transcription factors and signaling pathways interact are not fully understood, in large part because not many targets are known. We are using the Drosophila eye as a model to understand how tissue-specific transcription factors and signaling pathways function together to specify tissue development. One of the major tissue-specific transcription factors involved in eye specification throughout metazoa is the Pax6 paired-homeodomain protein. Consistent with its role in Drosophila eye specification, the Drosophila Pax6 homolog ey is both required for eye development, and capable of converting antennal, leg and wing precursors to an eye fate when misexpressed. Vertebrate Pax6 genes are also required for eye development, and ectopic expression can lead to ectopic eye formation. In principle, knowledge of Pax6 transcription factor targets could reveal a lot about the mechanisms by which it promotes eye specification, and recent efforts have identified a number of probable direct Ey targets with functions in Drosophila eye development. Four of the five that are currently known also encode transcription factors, including Eyes absent, Sine oculis, Optix and Atonal. Associated with asyn-induced cytotoxicity and develop therapeutic strategies for the treatment of PD. Among mutations linked to familial cases of PD, the A53T asyn variant was shown to aggregate at a much faster rate than wt asyn in cell cultures and in vitro. C-terminal truncations have also been reported to aggregate at higher rates than wt asyn, demonstrating that the proline-rich C-terminal region plays a fundamental role in limiting asyn misfolding and aggregation. Further, a hormone mediated explanation for the sexual dimorphic irisin response to sprint interval training seems unlikely as presumably the sex hormonal profile in the female participants would have been highly variable on account of the absence of menstrual phase standardized data collection. Thus, that a sexual dimorphic response was identified against the background of highly variable circulating sex hormone concentrations speaks to the strength of the dimorphic response. Circulating irisin and FGF21 have been linked statistically with indices of insulin resistance. No significant relationships were discovered at baseline or post-sprint interval training among primary outcome variables and glucose, insulin, or HOMA-IR. Again, this may be reflective of the relatively homogenous study population coupled with the good health status of the research participants. We report for the first time on the inverse association between irisin and PEDF. This inverse association is consistent with the current understanding of the respective roles of PEDF and irisin on insulin sensitivity. Whether the relation between these two variables is independent of co-variables remains to be seen. There are a few additional issues pertaining to these studies that warrant brief discussion. The first pertains to our choice of hypoxia as a method of evoking a sympathetic response.