In some parts of psychology the word encoding is used to describe what happens when we learn. It likens our learning to input into a computer, in which information is encoded into another form.
Amino acids join with the peptide bond , to become parts of peptides or polypeptides .
These often form very long sequences, to become major parts of enzymes and other kinds of proteins. Our hippocampus is a small part of our brain which plays a very important part in our ability to learn. It consists of several different areas, of which the dentate gyrus and CA areas are mentioned most often. Figure 4 has a picture of the hippocampus, showing its location in our brain and different parts. Trophins , chemicals which guide cell motion or growth of an animal of plant, occur very widely in many different life forms.