NCIt definition : Ligand binding proteins that bind signalling molecules external to the cell with high
affinity and convert this extracellular event into one or more intracellular signals
that alter the behavior of the target cell. The hormone receptor can be cytoplasmic/nuclear,
or associated with the cell membrane in the case of receptors whose ligands cannot
penetrate the membrane.;
Alternative definition : NCI-GLOSS: A cell protein that binds a specific hormone. The hormone receptor may
be on the surface of the cell or inside the cell. Many changes take place in a cell
after a hormone binds to its receptor.;