A protein consisting of four polypeptide subunits.

A tetramer is a protein made up of four subunits.

A tetramer is a protein with four subunits (tetrameric). There are homo-tetramers (all subunits are identical) such as glutathione S-transferase, dimers of hetero-dimers such as haemoglobin (a dimer of an alpha/beta dimer), and hetero-tetramers, where each subunit is different.

polymer with 4 components