Also available are "mock suppressors/silencers". Here, miRNAs can function as both oncogenes and tumor suppressors. Progestin receptors function as tumor suppressors in endometrial cancer cells. These proteins act as tumor growth suppressors, agents that regulate cell proliferation and differentiation. Fully automatic firearms and suppressors are prohibited for civilians. Both act as tumor suppressors by regulating the cell cycle. Jamming devices are called "signal suppressors" or "interference generators" or just jammers. Suppressors and machine guns are the most heavily regulated. It may also restrict firearm accessories, notably high-capacity magazines and sound suppressors. These tumor suppressors push the NSC to enter quiescence. Laws were introduced to make vehicle manufacturers fit interference suppressors. It used Sten magazines and had the capabilities of adapting suppressors. This theory also fits data for several tumor suppressors beyond BRCA1 or BRCA2. A version with a threaded barrel for suppressors, side folding stock, and modified sights. Hybrids and cancellers are sometimes combined with echo suppressors.