Autophosphorylate
Autophosphorylation takes place in an Enzyme-Linked receptor called a Receptor Tyrosine Kinase (RTK). When the external domain of the receptor comes into contact with a signal it dimerises. This then triggers lots of phosphates to bind to the intracellular domain of the receptor providing a docking site for other proteins. This is autophosphorylation. (Enzyme-Linked Receptors, http://www.fastbleep.com/biology-notes/31/174/1000, accessed on 22/11/13)