 In this paper, we study the light-based minimum-time circadian entrainment problem of mammals, Neurospora, and Drosophila based on mathematical models of clock gene transcription .
<clarity>  In this paper, we study the light-based minimum-time circadian entrainment problem of mammals, Neurospora, and Drosophila based on mathematical models of clock gene transcription .
 In this paper, we study the light-based minimum-time circadian entrainment problem of mammals, Neurospora, and Drosophila based on mathematical models of their circadian gene regulation .