Communication within animal cells

Networks of extracellular and intracellular signals

Role of cell structure in intracellular communication

The plasma-membrane receptors and GTP-binding proteins

The protein kinases and phosphatases

The cyclic nucleotides

The inositol polyphosphates and diacylglycerols

Calcium

The intermediary metabolites

Metabolites of arachidonic acid

Sequence-specific DNA-binding proteins

The oncogenes

Interactions between pathways of intracellular communication.