c8e8fc540646df02203db3233f927e10fc7630d2 mspeir Wed Sep 23 15:55:37 2026 -0700 Conservation track descriptions: stop wrapping the download list in a <p>, refs #34803 A <ul> is not allowed inside a <p>, so the </p> that followed each download list was parsed as an implicit empty paragraph and thrown away. Close the paragraph after the lead-in sentence instead, and leave the list at the same level as the other paragraphs. 113 pages, one moved </p> each. Nothing renders differently; HTML Tidy goes from 226 warnings on these sections to none. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> diff --git src/hg/makeDb/trackDb/xenTro/xenTro1/multiz5way.html src/hg/makeDb/trackDb/xenTro/xenTro1/multiz5way.html index 0b4c8e487bf..8136599f7ba 100644 --- src/hg/makeDb/trackDb/xenTro/xenTro1/multiz5way.html +++ src/hg/makeDb/trackDb/xenTro/xenTro1/multiz5way.html @@ -1,176 +1,176 @@ <H2>Description</H2> <P> This track shows a measure of evolutionary conservation in <em>$Organism</em>, chicken, human, mouse, and zebrafish, based on a phylogenetic hidden Markov model (phastCons). Multiz alignments of the following assemblies were used to generate this annotation: <UL> <LI><em>$Organism</em> $date ($db) <LI>chicken Feb. 2004 (galGal2) <LI>human May 2004 (hg17) <LI>mouse May 2004 (mm5) <LI>zebrafish Nov. 2003 (danRer1) </UL></P> <P> In full display mode, this track shows the overall conservation score across all species as well as pairwise alignments of each species aligned to the <em>$Organism</em> genome. The pairwise alignments are shown in dense display mode using a grayscale density gradient. The checkboxes in the track configuration section allow the exclusion of species from the pairwise display; however, this does not remove them from the conservation score display. </P> <P> When zoomed-in to the base-display level, the track shows the base composition of each alignment. The numbers and symbols on the Gaps line indicate the lengths of gaps in the <em>$Organism</em> sequence at those alignment positions relative to the longest non-<em>$Organism</em> sequence. If there is sufficient space in the display, the size of the gap is shown; if not, and if the gap size is a multiple of 3, a "*" is displayed, otherwise "+" is shown. To view detailed information about the alignments at a specific position, zoom in the display to 30,000 or fewer bases, then click on the alignment.</P> <P> This track may be configured in a variety of ways to highlight different aspects of the displayed information. Click the <A HREF="../goldenPath/help/hgWiggleTrackHelp.html" TARGET=_blank>Graph configuration help</A> link for an explanation of the configuration options.</P> <H2>Methods</H2> <P> Best-in-genome blastz pairwise alignments were multiply aligned using multiz, beginning with <em>$Organism</em>-chicken alignments and subsequently adding in human, mouse, and zebrafish. The resulting multiple alignments were then assigned conservation scores by phastCons.</P> <P> The phastCons program computes conservation scores based on a phylo-HMM, a type of probabilistic model that describes both the process of DNA substitution at each site in a genome and the way this process changes from one site to the next (Felsenstein and Churchill 1996, Yang 1995, Siepel and Haussler 2005). PhastCons uses a two-state phylo-HMM, with a state for conserved regions and a state for non-conserved regions. The value plotted at each site is the posterior probability that the corresponding alignment column was "generated" by the conserved state of the phylo-HMM. These scores reflect the phylogeny (including branch lengths) of the species in question, a continuous-time Markov model of the nucleotide substitution process, and a tendency for conservation levels to be autocorrelated along the genome (i.e., to be similar at adjacent sites). The general reversible (REV) substitution model was used. Note that, unlike many conservation-scoring programs, phastCons does not rely on a sliding window of fixed size, so short highly-conserved regions and long moderately conserved regions can both obtain high scores. More information about phastCons can be found in Siepel et al. (2005).</P> <P> PhastCons currently treats alignment gaps as missing data, which sometimes has the effect of producing undesirably high conservation scores in gappy regions of the alignment. We are looking at several possible ways of improving the handling of alignment gaps.</P> <h2>Data Access</h2> <p> The alignments and the conservation scores can be retrieved for a single region or for a list of regions with the <a href="hgTables?db=xenTro1&hgta_group=compGeno&hgta_track=multiz5way">Table Browser</a>, which returns the alignments in MAF format and the scores as wiggle data. The conservation scores, though not the alignments, can also be joined with other annotations in the <a href="hgIntegrator?db=xenTro1">Data Integrator</a>. For automated access, our <a href="../goldenPath/help/api.html">REST API</a> serves the alignment and conservation tracks individually, by name. </p> <p> The files behind this track can be downloaded from our download server: +</p> <ul> <li><a href="https://hgdownload.soe.ucsc.edu/goldenPath/xenTro1/multiz5way/" target="_blank">Multiz alignments and phylogenetic trees</a></li> </ul> -</p> <p> Genome-wide alignment files are large. Among our command-line programs, <tt>mafsInRegion</tt>, <tt>mafSpeciesSubset</tt> and <tt>mafFrags</tt> pull out a region, a subset of species, or the alignment underlying a gene. They can be downloaded from the <a href="https://hgdownload.soe.ucsc.edu/admin/exe/" target="_blank">utilities directory</a>, and each one prints its usage when run with no arguments. See our <a href="../FAQ/FAQdownloads.html">Data Access FAQ</a> for more information. </p> <H2>Credits</H2> <P> This track was created at UCSC using the following programs: <UL> <LI> Blastz and multiz by Minmei Hou, Scott Schwartz and Webb Miller of the <A HREF="http://www.bx.psu.edu/miller_lab/" TARGET=_blank>Penn State Bioinformatics Group</A>. <LI> AxtBest, axtChain, chainNet, netSyntenic, and netClass by Jim Kent at UCSC. <LI> PhastCons by Adam Siepel at Cornell University. <LI>"Wiggle track" plotting software by Hiram Clawson at UCSC. </UL> </P> <P>The phylogenetic tree is based on Murphy <EM>et al</EM>. (2001) and general consensus in the vertebrate phylogeny community. </P> <H2>References</H2> <H3>Phylo-HMMs and phastCons:</H3> <P> Felsenstein J, Churchill GA. <A HREF="https://academic.oup.com/mbe/article/13/1/93/1055515" TARGET=_blank>A hidden Markov model approach to variation among sites in rate of evolution</A>. <em>Mol Biol Evol</em>. 1996;13(1):93-104.</P> <P> Siepel A, Haussler D. Phylogenetic hidden Markov models. In R. Nielsen, ed., <em>Statistical Methods in Molecular Evolution</em>, pp. 325-351, Springer, New York (2005). </P> <P> Siepel A, Bejerano G, Pedersen JS, Hinrichs A, Hou M, Rosenbloom K, Clawson H, Spieth J, Hillier LW, Richards S <em>et al</em>. <A HREF="https://genome.cshlp.org/content/15/8/1034.full" TARGET=_blank> Evolutionarily conserved elements in vertebrate, insect, worm, and yeast genomes</A>. <em>Genome Res</em>. 2005;15(8):1034-50.</P> <P> Yang Z. <A HREF="https://www.genetics.org/content/139/2/993" TARGET=_blank> A space-time process model for the evolution of DNA sequences</A>. <em>Genetics</em>. 1995;139(2):993-1005.</P> <H3>Chain/Net:</H3> <P> Kent WJ, Baertsch R, Hinrichs A, Miller W, Haussler D. <A HREF="https://www.pnas.org/content/100/20/11484" TARGET=_blank> Evolution's cauldron: Duplication, deletion, and rearrangement in the mouse and human genomes</A>. <I>Proc Natl Acad Sci USA</I>. 2003;100(20):11484-9. <H3>Multiz:</H3> <P> Blanchette M, Kent WJ, Riemer C, Elnitski L, Smit AFA, Roskin KM, Baertsch R, Rosenbloom K, Clawson H, Green ED <em>et al</em>. <A HREF="https://genome.cshlp.org/content/14/4/708.full" TARGET=_blank> Aligning Multiple Genomic Sequences with the Threaded Blockset Aligner</A>. <em>Genome Res</em>. 2004;14(4):708-15. <H3>Blastz:</H3> <P> Chiaromonte F, Yap VB, Miller W. <A HREF="https://www.ncbi.nlm.nih.gov/pubmed/11928468?dopt=Abstract" TARGET=_blank>Scoring pairwise genomic sequence alignments</A>. <em>Pac Symp Biocomput</em>. 2002;115-26.</P> <P> Schwartz S, Kent WJ, Smit A, Zhang Z, Baertsch R, Hardison R, Haussler D, Miller W. <A HREF="https://genome.cshlp.org/content/13/1/103.full" TARGET=_blank> Human-Mouse Alignments with BLASTZ</A>. <em>Genome Res</em>. 2003;13(1):103-7.</P> <H3>Phylogenetic Tree:</H3> <P> Murphy WJ, Eizirik E, O'Brien SJ, Madsen O, Scally M, Douady CJ, Teeling E, Ryder OA, Stanhope MJ, de Jong WW, Springer MS. <A HREF="https://science.sciencemag.org/content/294/5550/2348" TARGET=_blank>Resolution of the early placental mammal radiation using Bayesian phylogenetics</A>. <EM>Science</EM>. 2001 Dec 14;294(5550):2348-51. </P>