Hierarchical Phase Transitions

The article frames cytoskeletal transformations as resembling phase transitions because macroscopic order changes while molecular identities remain constant. The hierarchy differs from single-order-parameter models because it uses multiple order parameters for distinct cytoskeletal order levels. PT3 aggregates stress fibers that are already aligned. PT1 forms stress fibers from disordered actin material. PT2 imposes directional order after stress fibers already exist.