IPod games are in the form of .ipg files, which are actually .zip archives in disguise. When unzipped, they reveal executable files along with common audio and image files, leading to the possibility of third party games. Apple has not publicly released a software development kit (SDK) for iPod-specific development. Apps produced with the iPhone SDK are compatible only with the iOS on the iPod Touch and iPhone, which cannot run clickwheel-based games. All iPods except for the iPod Touch can function in "disk mode" as mass storage devices to store data files but this may not be the default behavior.
JUNQ and IPOD IPOD may serve not only as a sequestration site, but also as a functional compartment. The IPOD is a non- membrane bound cellular site, which in yeast is located by the vacuole. FRAP and FLIP assays revealed that proteins in the IPOD are tightly packed, in-soluble and don't exchange with the cytosol. Amyloidogenic proteins, such as the Huntingtin protein, are the IPOD's substrates. Misfolded proteins must be non-ubiquitinated to be sorted to the IPOD. Ubiquitination of an otherwise IPOD substrate, such as the RNQ1 fungal prion, will result in its sequestration in the JUNQ inclusion. Upon accumulation of misfolded proteins,