(c) Too many missing gene-protein-reaction associations (GPR), either due to non-enzymatic reaction steps or knowledge gaps, before and after the contributing reaction can lead to wrongly activated paths, as missing GPR information is not punished by GIMME (invisible path).
In contrast, HGF is an ambivalent factor for ERK1/2 and its downstream effectors Elk1, c-Myc and ETS1, i.e. there is at least one inhibiting and one activating path emanating from HGF to these species.
Each matrix element, Dij, tells us whether the network contains (1) only activating paths, (2) only inhibiting paths, or (3) both activating and inhibiting paths, between species i and j.
Nevertheless, this explanation cannot be accepted out of hand: the dependency matrix reveals that RGT1 is an ambivalent factor with regard to SNF3, i.e., both repressing and activating paths from RGT1 to SNF3 exist.
This Δ V t) increase appeared from the retinotopic site of area 19/21 as a feedback signal toward the area 17/18 border where it activated the path to the next retinotopic site along the area 17/18 border (Figs 4 D and 5, Supplementary Movie 3).
If the nodes situated between the first (third,...) and second (fourth,...) inhibitory edge in the overall activating path already have complementary nodes in the expanded network due to their involvement in other paths, the path will be retained in the expanded network.
See related research by Oiva et al., http://ccforum.com/content/14/6/R207 Recently, a single center study conducted by Oiva and coworkers and published in Critical Care [ 1] demonstrated that phospho-specific whole blood flow cytometry could be used to assess activated signaling path-ways in leukocytes isolated from pancreatitis patients.
This stimulation excites the nerves in the spinal cord and activates the path of the motor command.
Tox21's essential premise is that scientists can infer human harm from chemicals on the basis of how they activate toxicity path ways in cells.
In this problem we are given a network with edge capacities and point-to-point demands, and the goal is to allocate two edge-disjoint paths for each demand (a working path and a so-called restoration path, which is activated only if the working path fails) so that the capacity constraints are satisfied and the total cost of the used and reserved bandwidth is minimized.
