294e9bf7a3169d3dd8c176fb896cbd0c5066ea22
max
  Thu Apr 30 02:10:35 2026 -0700
docs updates, refs #35059

diff --git src/hg/makeDb/trackDb/human/cloneEndSuper.html src/hg/makeDb/trackDb/human/cloneEndSuper.html
index 2ba77ad112b..9bca18d12d0 100644
--- src/hg/makeDb/trackDb/human/cloneEndSuper.html
+++ src/hg/makeDb/trackDb/human/cloneEndSuper.html
@@ -1,21 +1,34 @@
 <H2>Description</H2>
 <P>
 This track shows the NCBI clone end mappings from the
 <A HREF="https://ncbiinsights.ncbi.nlm.nih.gov/2019/05/01/clone-db-retirement/"
 TARGET=_blank>NCBI Clone DB</A> database.  Libraries with more than
-30,000 clones are included in this track display.</P>
+30,000 clones are included in this track display.
+While the NCBI Clone DB database interface has been retired and is no longer
+available, they were archived and are still accessible for download at NCBI and through the
+UCSC Genome Browser.</P>
+<P>
+<b>Clone availability:</b> most of the clone libraries shown here can
+no longer be ordered.  Two librarires that we show are exceptions and are still available
+for ordering from
+<A HREF="https://bacpacresources.org/libraries.php" TARGET=_blank>BACPAC
+Genomics</A> who still sells the libraries made by and formerly distributed by
+Children's Hospital Oakland Research Institute (CHORI): the 
+<A HREF="hgTrackUi?g=bacRearray32k">BCGSC Human 32k BAC Re-Array</A>
+(minimal tiling set, mostly RP11 and CTD clones) and the CHORI-17 (CH17)
+BAC library from a hydatidiform mole.</P>
 <P>
 Bacterial artificial chromosomes (BACs) are a key part of many
 large-scale sequencing projects.  A BAC typically consists of 50 - 300 kb of
 DNA.  During the early phase of a sequencing project, it is common
 to sequence a single read (approximately 500 bases) off each end of
 a large number of BACs.  Later on in the project, these BAC end reads
 can be mapped to the genome sequence.</P>
 <P>
 These BAC end pairs can be useful for validating the assembly over
 relatively long ranges.  In some cases, the BACs are useful biological
 reagents.  This track can also be used for determining which BAC
 contains a given gene, useful information for certain wet lab experiments.</P>
 <P>
 The scoring scheme used for this annotation assigns 1000 to an alignment
 when the BAC end pair aligns to only one location in the genome (after