They mediate both excitatory and inhibitory neurotransmission. Receptors that mediate TXA2 actions are thromboxane A2 receptors. SK2 potassium channels mediate inhibitory influence on action potentials and reduce arborization. The adapter proteins and kinases that mediate TLR signaling have also been targeted. Wnt signaling helps mediate this process, particularly during convergent extension. Photons mediate electromagnetic interactions between particles in quantum electrodynamics. Cytokines mediate and control immune and inflammatory responses. There are two main hypotheses on the cognitive mechanisms that mediate host distinguishing of eggs. Some interleukins are classified as lymphokines, lymphocyte-produced cytokines that mediate immune responses. Small RNA molecules, too, may mediate inherited resistance to infection. They are expressed in the vertebrate retina and mediate vision. Hemolysins may also mediate bacterial escape from host cells. These enzymes ultimately mediate the synthesis and release of PGE2. The CrPV needs eS25 to begin translation and mediate ribosome recruitment. The Sertoli cells themselves mediate parts of spermatogenesis through hormone production.