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CloudFront caches responses to and requests and, optionally, requests. CloudFront does not cache responses to requests that use the other methods.

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If you choose GET, HEAD, OPTIONS or GET, HEAD, OPTIONS, PUT, POST, PATCH, DELETE , you might need to restrict access to your Amazon S3 bucket or to your custom origin to prevent users from performing operations that you don't want them to perform. The following examples explain how to restrict access:

Create a CloudFront origin access identity to restrict access to your Amazon S3 content, and grant the origin access identity the applicable permissions. For example, if you configure CloudFront to accept and forward these methods because you want to use , you must still configure Amazon S3 bucket policies or ACLs to handle requests appropriately. For more information, see .

Configure your origin server to handle all methods. For example, if you configure CloudFront to accept and forward these methods because you want to use , you must still configure your origin server to handle requests appropriately.

Specify whether you want CloudFront to cache the response from your origin when a viewer submits an OPTIONS request. CloudFront always caches the response to GET and HEAD requests.

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Regardless of the option that you choose, CloudFront forwards certain headers to your origin and takes specific actions based on the headers that you forward. For more information about how CloudFront handles header forwarding, see HTTP Request Headers and CloudFront Behavior (Custom and S3 Origins) .

For more information about how to configure caching in CloudFront by using request headers, see Caching Content Based on Request Headers .

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A series of recent studies have revealed that mouse and human ES cells possess certain novel epigenetic features. Polycomb-group (PcG) complex proteins mainly act to stabilize a repressive chromatin structure. Polycomb repressive complex 2 (PRC2), which consists of Ezh2, Eed and Suz12 in ES cells, functions as a histone methyltransferase on lysine 27 (K27) of histone H3, resulting in its tri-methylation (H3K27me3), a methylation mark that is associated with transcriptionally inactive genes ( Sale Professional Asymmetric Ruffled Cottonblend Poplin Skirt Light gray Marques Almeida Sale Reliable Cheap Online Store Sale Many Kinds Of Discount Looking For ZxXQxI
). In general, the distribution of this repressive chromatin mark is mutually exclusive to that of the tri-methylation mark H3K4me3, which is associated with transcriptionally active regions ( Atea Oceanie Structured Wool Jacket Find Great For Sale For Cheap Clearance Cheap 5e5uz
; Lund and van Lohuizen, 2004 ). However, Bernstein et al. reported that in mouse ES cells, these histone marks co-localize in particular regions, which they named `bivalent domains' ( Bernstein et al., 2006 ). These domains, which are composed of short chromatin elements marked by H3K4me3 flanked by larger regions that contain H3K27me3, are associated with genes that are expressed at low levels ( Fig. 5B ) ( Bernstein et al., 2006 ). Interestingly, the bivalent domains map to highly conserved noncoding elements (HCNEs) that have previously been identified as being conserved among the genomes of primates and rodents and which contain few retrotransposons ( Bernstein et al., 2006 ). Moreover, half of these bivalent domains contain target sites that are common to Oct3/4, Sox2 and Nanog, as identified by genome-wide ChIP-on-Chip analysis ( Boyer et al., 2005 ). Thus, these domains might signify the chromatin structure of genes that are in a differentiation-ready state, as proposed in the `Localised Marking Model' by Szutoristz and Dillon ( Szutoristz and Dillon, 2005 ). According to this model, most tissue-specific genes in ES cells would be targets for sequence-specific factors that can recruit histone-modifying enzymes, resulting in the formation of early transcription competence marks (ETCMs), which are enriched for histone H3 and H4 acetylation (H3Ac and H4Ac, respectively), and H3K4me3, all of which are histone marks associated with transcriptionally active regions. In both bivalent domains and ETCMs, H3K4me3 marks spread as genes near them become transcriptionally active, whereas H3K27me3 exclusively occupies those genes that are repressed during the differentiation of a particular cell type. Because the global level of H3K27me3 in ES cells is lower than that in differentiated cells, the mechanism by which this repressive mark targets such sites is of interest. Lee et al. ( Faye Top LIKELY Discount Low Shipping Recommend Cheap Official Cheap Online Collections Sale Online Discount Comfortable rl15QY
) performed ChIP-on-Chip analysis for Suz12, Eed and H3K27me3, and revealed that Suz12- and Eed-binding sites significantly overlap with each other and with H3K27me3 marks on the highly evolutionarily-conserved regions of transcriptionally silent genes, including Gata4 and Cdx2 , in ES cells. The 1800 genes identified as targets of Suz12 included most of the targets repressed by Oct3/4, Sox2 and Nanog ( Boyer et al., 2005 ). Boyer et al. ( How Much Cheap Price Libby Edelman Long Sleeve Star Print Top Libby Edelman Geniue Stockist Cheap Price Clearance Deals qzZ5d
) also identified 512 common target genes of PRC2 and PRC1 by ChIP-on-Chip analysis and found that they were marked by H3K27me3, and that 87% were upregulated in the absence of PRC2 in Eed -null ES cells.

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