Plant vacuoles are fluid-filled organelles bound by a single membrane called the tonoplast ... protein storage vacuoles of neutral pH, and the lytic vacuoles of acidic pH, which are equivalent ...
Cartoon of the 3D models of the broad bean (right, pink-violet) and the thale cress (left, blue) TPC1 ion channel protein in the vacuole membrane. On the left, Calcium ions (red spheres ...