2/3 holin family
The 2 or 3 TMS Putative Holin (2/3 Holin) Family
([http://tcdb.org/search/result.php?tc=1.E.33 TC# 1.E.33]) consists of many proteobacteria
l proteins ranging in size from about 70 to 120 amino acyl residues (aas) in length that exhibit 2 or 3 predicted transmembrane segments (TMSs). Although annotated as holins, these proteins are not yet functionally characterized. A representative list of proteins belonging to the 2/3 Holin family can be found in the [http://tcdb.org/search/result.php?tc=1.E.33.2 Transporter Classification Database].