Complex sentence: HGMA proteins are polypeptides of ~ 100 amino acid residues characterized by a modular sequence organization, with three highly positively-charged regions, termed AT hooks, that bind the minor groove of AT-rich DNA stretches in specific regions of DNA.
Split into simpler sentences: HGMA proteins are polypeptides of ~ 100 amino acid residues characterized by a modular sequence organization. These proteins have three highly positively-charged regions, termed AT hooks, that bind the minor groove of AT-rich DNA stretches in specific regions of DNA.