In embryology, the concept of lateral inhibition has been adapted to describe processes in the development of cell types.  Lateral inhibition is described as a part of the Notch signaling pathway , a type of cell–cell interaction. Specifically, during asymmetric cell division one daughter cell adopts a particular fate that causes it to be copy of the original cell and the other daughter cell is inhibited from becoming a copy. Lateral inhibition is well documented in flies, worms and vertebrates.  In all of these organisms, the transmembrane proteins Notch and Delta (or their homologues) have been identified as mediators of the interaction. Research has been more commonly associated with Drosophila , the fruit fly. 
Although this mechanism for the specific control of gene activity may not apply to the regulation of all inducible enzymes—for example, those concerned with the utilization of the sugar arabinose—and is not universally applicable to all coarse control processes in all microorganisms, it can explain the manner in which the presence in growth media of at least some cell components represses (., inhibits the synthesis of) enzymes normally involved in the formation of such components by gut bacteria such as E. coli . Although, for example, the bacteria must obviously make amino acids from ammonia if that is the sole source of nitrogen available to them, it would not be necessary for the bacteria to synthesize enzymes required for the formation of amino acids supplied preformed in the medium. Thus, of the three aspartokinases formed by E. coli , two are repressed by their end products, methionine and lysine. On the other hand, the third aspartokinase, which (as described above) is inhibited by threonine, is repressed by threonine only if isoleucine is also present. This example of so-called multivalent repression is of obvious physiological utility. It is likely that the amino acids that thus specifically inhibit the synthesis of aspartokinases do so by combining with specific protein repressor molecules; however, whereas the combination of the inducer with the repressor of β-galactosidase inactivates the repressor protein and hence permits synthesis of the enzyme, the repressor proteins for biosynthetic enzymes would not bind to DNA unless they were also combined with the appropriate amino acid. Aspartokinase synthesis would thus occur in the absence of the end-product effectors and not in their presence.
G. To evaluate effects of IKBKE/TBK1 inhibition on NF-κB signaling in Ewing, TC32 cells were incubated with CYT387 for six hours prior to stimulation with TNF-α (30 ng/mL). IκBα degradation was measured by harvesting TC32 cells thirty minutes after stimulation with TNF-α. TNF-α stimulation resulted in degradation of IκBα, and this effect was attenuated with CYT387 treatment. Parthenolide, an inhibitor of IκBα phosphorylation was used as a positive control. Similar effects of CYT387 activity were seen in HEK-293T cells which also express IKBKΕ. Nuclear extracts were prepared from TC32 cells harvested following forty-five minutes of TNF-α stimulation. Treatment with CYT387 resulted in decreased nuclear localization of NF-κB family proteins RelA/p65 and c-Rel. There was a modest impairment of p50 nuclear localization as compared to parthenolide and DMSO controls and no change in p52 nuclear localization. RelB (not shown) is not expressed in TC32 cells