Inositol phosphate

Inositol phosphates are a group of mono- to polyphosphorylated inositols. They have important messaging functions in the cells.

The group comprises:
 * inositol monophosphate
 * inositol trisphosphate
 * inositol pentakisphosphate
 * inositol hexaphosphate

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

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