Each histone core complex contains a single tetramer made up of the H3 and H4 proteins.
Tetramer: A compound made up of four smaller components that are either identical or fairly similar. Covalent or noncovalent forces can be used to link the units together. This tetrapeptide is made up of four similar amino acid residues and is a tetramer called Gly-Gly-Gly-Gly (each is a glycine).
A tetrameric protein called hemoglobin binds and moves four oxygen molecules at a time before releasing them to myoglobin. Every oxygen molecule that binds to hemoglobin helps the molecule that binds after it, which is known as allosteric cooperative binding.
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