This model represents the transmembrane protein EccB of the actinobacterial flavor of type VII secretion systems. Species such as Mycobacterium tuberculosis have several instances of this system per genome, designated EccB1, EccB2, etc. This model does not identify functionally related proteins in the Firmicutes such as Staphylococcus aureus and Bacillus anthracis. [Protein fate, Protein and peptide secretion and trafficking]