Mention AXTCHAIN

diff --git a/tags/alignment.mdwn b/tags/alignment.mdwn
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 _Work in progress_
 
+## Chains and nets
+
+Kent and coll. ([[2003|biblio/14500911]]) computed _chained alignments_ with
+the AXTCHAIN program.
+
 ## LAST
 
 see [[LAST]] for a detailed bibliography.