Before revision:   Here we construct a simplified cell-cycle model in budding yeast to investigate the underlying mechanism that ensures the robustness in the multi-step process . First, we establish a three-variable model and select a parameter set that can qualitatively describe the yeast cell-cycle process.
After revision:  Here we construct a simplified cell-cycle model in budding yeast to investigate the underlying mechanism that ensures robustness in this process containing sequential tasks (DNA replication and mitosis). We first establish a three-variable model and select a parameter set that can qualitatively describe the yeast cell-cycle process.