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The quantification of immunoreactive cells in the SGZ was performed using stereology by an examiner blinded to treatment. Using an Olympus BX-51 microscope at 400�� magnification and continual adjustment through the depth of the section, immunoreactive cells in the SGZ were counted in every ninth section through the septotemporal axis of the hippocampus. The section sampling fraction was 1/9, and the resulting number for each region was multiplied by 9 to obtain an estimate of http://www.selleckchem.com/products/Thiazovivin.html the total number of cells per dentate gyrus. Because the raw counts (before multiplication) for the immunoreactive cells counted here were low according to disector/fractionator standards, we used an area sampling fraction of 1 as is commonly used for counting rare populations of cells (DeCarolis et al., 2013, Lagace et al., 2007, Lagace et al., 2010, Mandyam et al., 2007?and?Mandyam et al., 2004); the height sampling fraction was set at 1. For Type-1 cell analysis, GFP+ cells with a radial process perpendicular to the SGZ were similarly quantified by a single observer blinded to experimental condition (DeCarolis et al., 2013?and?Lagace et al., 2010). For DCX+ cells and 53BP1+ foci quantification, the optical fractionator method was used with section sampling fraction of 18, appropriate area sampling fractions, and guard zones to only quantify the inner 10 ��m of each sampling site, essentially as described (Melvin http://www.selleckchem.com/screening/selective-library.html et al., 2007). Images were taken and imported into Photoshop (Adobe Systems) for composition purposes. In order https://en.wikipedia.org/wiki/Adenine to include an animal for histological quantification, all sections needed to be present and stained uniformly; in cases where the hippocampus was not sectioned through the posterior extent or where sections were lost or destroyed during staining, the animal was removed from analysis. Data are reported as mean��SEMmean��SEM. Statistical analyses were performed using either a Student's t ?-test, one- or two-way analysis of variance (ANOVA) followed by Dunnett's ( Fig. 1?and?Fig. 2) or Sidak ( Fig. 3?and?Fig. 4) post-hoc analysis, respectively. Student's t ?-test was used to either compare two energies, doses, or time points ( Fig. 1, Fig. 3?and?Fig. 4). In two instances Student's t ?-test was used after a one-way ANOVA ( Fig. 2C) and a two-way ANOVA ( Fig. 4G) to examine general differences in doses. All statistical analyses were performed using Prism GraphPad (version 6.0c) software. Genotypes were analyzed separately to account for slight age differences of the Nestin-GFP vs. Nestin-Cre/YFP available for the irradiation experiment at NSRL/BNL. Statistical significance was defined as p