Task: Text Categorization
Input (English): In the pituitary gland, stimulation by LHRH causes repeated spikes in the cytosolic concentration of this ion, while the TRP channel opens in response to low levels of this ion in the endoplasmic reticulum. This ion is necessary for the formation of tight junctions, and cell-cell adhesion is prevented in solutions deficient in this ion, but only when expressing E-cadherin. A rise in the concentration of this ion causes secretion of insulin, and myosin light-chain kinase is activated by a complex of four of these ions and a certain protein. For 10 points, name this ion that binds to calmodulin and is stored in the sarcoplasmic reticulum, best known for being the most prevalent cation in bone matrix.
Output (English): Science