Ca2+ signaling functions to regulate many cellular processes. Dynamics of Ca2+ signaling or homeostasis is regulated by the interaction between ON and OFF reactions that control Ca2+ flux in both the plasma membrane and internal organelles such as the endoplasmic reticulum (ER) and mitochondria. External stimuli activate the ON reactions. which include Ca2+ into the cytoplasm either t... https://www.sahmbuffy.com/product-category/fluorescent-tubes/