Adaptor Proteins, Signal Transducing BIM1 protein, S cerevisiae Cell Cycle Proteins FUS3 protein, S cerevisiae MAP Kinase Signaling System MAP kinase MAPK signaling Microtubule Proteins Microtubules Mitogen-Activated Protein Kinases Pheromones STE5 protein, S cerevisiae Saccharomyces cerevisiae Saccharomyces cerevisiae Proteins Saccharomyces cerevisiae protein Signal Transduction Single-Cell Analysis cell cycle protein cell-to-cell variability genetic screen genetics metabolism microtubule microtubule protein microtubules mitogen activated protein kinase noise pheromone signal transducing adaptor protein signal transduction