I. INTRODUCTION
A. State-of-the-Art in Communication Hierarchies
B. Contribution Summary
C. Survey Organization
D. Comparison with Existing MC Surveys
II. COMMUNICATION HIERARCHY FOR SIGNALING IN CELL BIOLOGY
A. Defining Communication Devices
B. Our Proposed Hierarchy
III. LEVEL 1 - PHYSICAL SIGNAL PROPAGATION
IV. LEVEL 2 - PHYSICAL AND CHEMICAL SIGNAL INTERACTION
V. LEVEL 3 - PHYSICAL/DATA INTERFACE
VI. LEVEL 4 - LOCAL DATA ABSTRACTION
VII. LEVEL 5 - APPLICATIONS
VIII. END-TO-END CASE STUDIES
IX. OPEN PROBLEMS
X. CONCLUSION