Amino Acid (a.a.) Monoamine
Small organic molecule containing both a carboxyl group and an amino
group bonded to the same carbon atom.
For example: histamine ; serotonine ;
epinephrine ; norepinephrine .
Peptide
A molecule formed by joining two or more amino acids .
For example, ECF-A
Polypeptide
Many peptides joined together.
For example, insulin .
Protein
A molecule composed of many amino acids and with a complex structure.
For example, immunoglobulin , casein .
Glycoprotein
A protein coated with sugars.
For example, cytokines .
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