Diverse gene regulatory mechanisms alter rattlesnake venom gene expression at fine evolutionary scales 

Abstract
Understanding and predicting the relationships between genotype and phenotype is often challenging, largely due to the complex nature of eukaryotic gene regulation. 

https://academic.oup.com/gbe/advance-article/doi/10.1093/gbe/evae110/7675271?searchresult=1
Siddharth S Gopalan, Blair W Perry, Yannick Z Francioli, Drew R Schield, Hannah D Guss, Justin M Bernstein, Kaas Ballard, Cara F Smith, Anthony J Saviola, Richard H Adams, Stephen P Mackessy, Todd A Castoe