KCNN4 and asthma: Two potassium channels (KV1.3 & KCa3.1), expressed in non-excitable cell types (KV1.3: T-cells; KCa3.1: mast cells, macrophages, airway smooth muscle cells, fibroblasts and epithelial cells), have emerged as potential targets as these KCN isoforms are widely distributed in immune and structural airway cells, playing a key role in cellular activation, proliferation and migration, major factors in asthma pathophysiology [2].