Fig. 20.2 Localization of hormone receptors.
Fig. 20.3 Four classes of ligand-triggered
cell-surface receptors.
Fig. 20.4 Structure of four common intracellar
second messengers.
Fig. 20.5 Reversible states of common signaling
components.
Fig. 20.6 Common signaling pathways downstream
from G-protein-coupled receptors and receptor tyrosine kinases.
