Today, 42 years since the annexation of East Jerusalem, it seems that the future of Palestinian Jerusalemites is gloomier than ever, and that their pathways of existence are narrowing.
Due to the unified mode of inactivation of the pRb/p16 pathway and existence of the regulatory feedback the vast majority of HR-HPV-positive cervical tumors display strong a p16ink4a expression.
The analysis of the model for this pathway identified existence of two different dynamical regimes, and depending on parameters, the system can switch from single-state bi-stability to oscillations [ 63].
However, although there is evidence to suggest that glyphosate can inhibit multiple cellular functions such as mitochondrial respiration, and enzyme activities other than EPSPS within the shikimate pathway, the existence of such direct mechanisms of interference at the low environmental dose tested here currently remains unknown and thus needs further exploration.
Also, it was recently elucidated that HIF-1 α protein synthesis depends on a phosphatidylinositol 3-kinase (PI3 K-) Akt-mammalian target of the rapamycin (mTOR) signaling transduction pathway because of the existence of a polypyrimidine tract in the 5′-untranslated region of HIF-1 α mRNA [ 31, 32].
Even in organisms with the complete biosynthetic pathway, the existence of B12 and precursor transporters may impart selective advantages during times of hardship or during different life stages.
Caveolin is the major component of another very well described endocytic pathway, the so-called caveolae-dependent endocytic pathway, the existence of which in B-cells is controversially [53], [54], [55], [56], [57].
The major distinctions of Sc. pombe cells in the control of lesion tolerance pathways are the existence of pathways that involve various TLS polymerases, the TLS requirement for enzymes needed for mono- and polyubiquitination of PCNA and, surprisingly, the mostly error-free bypass of various DNA lesions regardless of the polymerase or polymerases synthesizing through them (Coulon et al. 2010).
For some of the Wnt pathway genes the existence of splice variants was either proposed (e.g. β-Catenin and CTNNB1) or described only in non-colon tissues (e.g. GSK3β) or hitherto not published (e.g. LRP5).
Presence of 2,4-dichlorobenzoate degradation pathway supported the existence of an efficient enzyme system for chlorobenzoate degradation already established for P. aeruginosa strains [ 78].
An interesting property of the p38 MAPK pathway is the existence of two parallel signalling branches, through MKK3 and MKK6, that both can phosphorylate p38 MAPK.
