Under physiological conditions, B-cell autoimmunity is counteracted by several tolerance mechanisms including receptor editing, anergy, and clonal deletion.
In addition, a crucial question for the maintenance of polymorphism is to what extent frequency-dependent foraging by visual predators is counteracted by other selective processes, including non-visual predation.
Oxygen-derived reactive species, such as superoxide anion radical (O2−) and hydrogen peroxide (H2O2), are important mediators of several types of cell damage, their deleterious action being physiologically counteracted by antioxidant cell defences, including vitamins, glutathione and antioxidant enzymes (Galeotti et al, 1990).
However, its overall benefits are counteracted by some of its side-effects, including incomplete lysis of clots, an increased risk of hemorrhagic transformation and the possibility of neurotoxicity.
Indeed, the unrelenting activity of dominant oncogenes is likely to be counteracted by a certain extent of reactive adaptation, including activation of compensatory pathways and positive or negative feedback loops.
In many organisms, including humans, this process is counteracted by an energy-costly repair system involving S-adenosylmethionine-mediated methylation of isoaspartate and reversion to aspartate (Clarke 2003).
A walking robot, by contrast, can fall in many directions, including some that cannot easily be counteracted by a motor.
And that lower risk is not counteracted by increased risks of dying from any other disease, including cancer, diabetes or heart disease.
Such deleterious conditions are counteracted by the gradual replacement of electrolytes with organic osmolytes including sorbitol, betaine, myo-inositol, taurine and glycerophosphocholine.
Ectopic expression of MRPL41 induces cell death in several mammalian cell lines including primary embryonic fibroblasts of mice and human origin, and in NIH/3T3 cells, which is counteracted by BCL-2 [ 12, 13].
