Before revision:  However, the regulation of gene expression at the level of an individual cell involves reactions between finite numbers of molecules, and this can result in inherent randomness in oscillatory dynamics. Furthermore, the process of transcription has been shown to be bursty, which blurs the boundaries between aperiodic fluctuations and noisy oscillators.
After revision:  However, the regulation of gene expression at the level of an individual cell involves reactions between finite numbers of molecules, and this can result in inherent randomness in expression dynamics, which blurs the boundaries between aperiodic fluctuations and noisy oscillators.