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QuickTime Alternative is a smaller package and lacks the full complement of software included in Apple QuickTime, including QuickTime Player, PictureViewer, and any QuickTime Pro features. In addition, QuickTime Alternative does not run background processes such as the optional QuickTime Tray Icon from the official distribution. [citation needed]
Alternative pathway. (Some labels are in Polish.) The alternative pathway is a type of cascade reaction of the complement system and is a component of the innate immune system, a natural defense against infections. The alternative pathway is one of three complement pathways that opsonize and kill pathogens.