Inositol phosphates

Inositol phosphates are a group of mono- to polyphosphorylated inositols. They play crucial roles in diverse cellular functions, such as cell growth, apoptosis, cell migration, endocytosis, and cell differentiation. The group comprises:

Inositol trisphosphates act on the inositol triphosphate receptor to release calcium into the cytoplasm. Further reading: Function of calcium in humans

Inositol tetra-, penta-, and hexa-phosphates have been implicated in gene expression and Steger (both in Science Magazine).

...
Wikipedia