Calcium participates in the cascade by activating other proteins.

Proprotein convertases are a family of proteins that activate other proteins.

Syk can, in turn, activate other proteins such as LAT.

PKC in turn activates other cytosolic proteins by phosphorylating them.

Eventually the macrophages communicate with and activate other specialized proteins involved in inflammation and immunity.

A cascade of phosphorylation reactions eventually activates a dormant transcription factor or cytoskeletal protein, thus contributing to the differentiation process in the target cell.

MPFs activate other proteins through phosphorylation.

Interactions among peroxisome proliferator activated receptor-gamma, insulin signaling pathways, and steroidogenic acute regulatory protein in human ovarian cells.

One possibility is that a Fz receptor protein complex directly interacts with and activates proteins that stimulate the cytoskeleton to produce a hair (Fig.

These proteinases are also responsible for activating or inactivating specific proteins at the correct time in the virus life cycle, so ensure replication occurs at the right time.