99db113e49bd1dd42a3040eaed1e61188a117ecf
max
  Wed May 13 05:44:18 2026 -0700
mucins: new locus-specific mucin VNTR/non-VNTR exon track on hs1 (alpha)

Adds a new 'Locus-specific' container in the genes group with two
bigGenePred subtracks (mucinsVntr, mucinsNonVntr) derived from
Plender et al. 2024 supplementary table 2. The .ra and HTML files live
under trackDb/human/ so future locus-specific tracks can share them;
hs1 picks them up via include ../mucins.ra alpha.

refs #37540

diff --git src/hg/makeDb/trackDb/human/locusSpec.html src/hg/makeDb/trackDb/human/locusSpec.html
new file mode 100644
index 00000000000..9d77112661e
--- /dev/null
+++ src/hg/makeDb/trackDb/human/locusSpec.html
@@ -0,0 +1,27 @@
+<h2>Description</h2>
+
+<p>
+This is a collection of tracks that annotate individual gene loci or
+gene families that benefit from a curated, locus-specific representation
+beyond what the standard gene-prediction tracks provide. The tracks
+here are typically derived from focused studies that examined a single
+gene or a small set of related genes in detail.
+</p>
+
+<p>
+Subtracks currently in this collection:
+</p>
+<ul>
+  <li><a href="hgTrackUi?g=mucinsVntr">Mucin VNTR exons</a> &mdash;
+      the variable-number tandem repeat exons of the human mucin gene
+      family.</li>
+  <li><a href="hgTrackUi?g=mucinsNonVntr">Mucin non-VNTR exons</a> &mdash;
+      the remaining (non-VNTR) exons of the human mucin gene family.</li>
+</ul>
+
+<h2>Data Access</h2>
+
+<p>
+Each subtrack has its own description page with full details on the
+data source, processing steps, and download instructions.
+</p>