Complex sentence: Homomeric receptors contain 5 identical subunits, they have 5 binding sites located at the interface between two adjacent subunits, in the year 2000 two homomeric receptors had been identified in humans α7 and α8 receptors.
Split into simpler sentences: Homomeric receptors contain 5 identical subunits, they have 5 binding sites located at the interface between two adjacent subunits. In the year 2000 two homomeric receptors had been identified in humans α7 and α8 receptors.