Describe the differences between the common modes of action of extracellular molecules in the prompt.
An immune cell continually releases a signalling protein when active and deactivates itself when enough of this signal binds to receptors on the same cell. This is an example of
A group of dividing cells on the edge of a developing plant tissue produce a signalling molecule that slows or alters the growth of nearby cells further within the interior. This is an example of
Cells in the kidney produce a hormone that stimulates precursor cells in the bone marrow to form red blood cells. This is an example of