cation binding | ion binding | calcium ion binding | metal ion binding
sarcoplasmic reticulum | intracellular membrane-bounded organelle | cytoplasmic vesicle | cell | sarcoplasmic reticulum lumen | cytoplasm | intracellular organelle | endoplasmic reticulum | melanosome | Golgi apparatus | nuclear outer membrane-endoplasmic reticulum membrane network | endomembrane system | endoplasmic reticulum membrane | vesicle | endoplasmic reticulum lumen | extracellular region | membrane-bounded organelle | organelle | sarcoplasm | membrane-enclosed lumen | intracellular vesicle | intracellular | membrane