MYLK and airway hyperresponsiveness: Histological and immunohistochemistry studies were designed to study myosin light chain kinase (Mylk), a key regulator of myosin–actin filament phosphorylation in the cytoskeletal transcendent during the inflammatory response (e.g., apoptosis, vascular permeability, and leukocyte diapedesis), cell motility and morphology, and airway hyperresponsiveness.