voltage-gated calcium channel T-type Ca2+ channel IMR:0000773 T for transient. Low voltage activated transient current. Rapid voltage-dependent inactivation. Concentrated in conducting system of heart (sinoatrial node, atrioventricular node), smooth muscle, endocrine cells and some neurones. In the mature mammalian brain, they are prominent in thalamic and hypothalamic neurones. molecule_role