Along with other secretory systems, secretion via the type II secretion system, one of many secretory systems found in Gram-negative bacteria and is used to secrete a variety of different proteins, including bacterial toxins and degradative enzymes such as proteases and lipases, is a single-step process.
Along with other secretory systems such as the chaperone/usher pathway and the type IV secretion system, secretion via the type II secretion system is a two-step process. 
