This could activate caspase-2 and induce cell apoptosis. This pathway can activate enzymes and regulate gene expression. Modern cameras often activate flash units automatically. In neurons, an agonist drug may activate neurotransmitter receptors either directly or indirectly. Neutrophils can also activate macrophages with CD80 viaCD28. Weak external signals may also activate the intrinsic pathway of apoptosis. Many particles activate the inflammasome and induce IL-1 production. One can activate them, but likely will not survive. The listener can then activate knowledge and imagine new possibilities. However each IFN type can also activate unique STATs. They manage to activate the ship and return to Earth. Thus, mTORC1 can activate protein synthesis for the developing organism. He can also activate Dragon Force at will. PIP then activate GTPases back via GEF stimulation. They may directly activate B cells, regardless of their antigenic specificity.