Oscillations and chaos have always been interesting topics in the theory of dynamical systems. In systems biology, oscillations emerging from gene networks are known to be widespread as in circadian oscillations, various metabolic cycles and the cell cycle to name a few. According to the dynamical systems theory, chaotic behavior can also be produced in strongly-coupled gene regulatory networks(GRNs) with dimensions equal to or exceeding three. Although there is a large number of studies focusing ...