“Small, mitotically dormant cholangiocytes are activated during damage of large cholangiocytes by activation of D‐myo‐inositol 1,4,5‐trisphosphate/Ca2+/calmodulin‐dependent protein kinase (CaMK) I. gamma‐Aminobutyric acid (GABA) affects cell functions by modulation of Ca2+‐dependent signaling and AC.”