Contacts between paired chromosome arms in Ciona.

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+[[!meta title="Molecular cytogenetic characterization of Ciona intestinalis chromosomes."]]
+[[!tag ciona chromosome]]
+
+Zoolog Sci. 2005 May;22(5):511-6 doi:10.2108/zsj.22.511
+
+Shoguchi E, Kawashima T, Nishida-Umehara C, Matsuda Y, Satoh N.
+
+Molecular cytogenetic characterization of Ciona intestinalis chromosomes.
+
+[[!pmid 15930823 desc="Ciona intestinalis has 10 metacentric pairs and 8 submetacentric or subtelomeric pairs of chromosomes."]]

diff --git a/tags/Ciona.mdwn b/tags/Ciona.mdwn
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--- a/tags/Ciona.mdwn
+++ b/tags/Ciona.mdwn
@@ -42,7 +42,10 @@ recent introgression then happened 15,000 years ago ([[Roux and coll.,
 Latest _Ciona robusta_ genome: version HT ([[Satou and coll.,
 2019|biblio/31621849]]) is a reassembly of the KS genome using Hi-C and PacBio
 additional data, in which over 95 % of the dequences is included in
-chromosomes.
+chromosomes.  Out of 14 pairs of chromosomes, 10 are metacentric ([[Shoguchi
+and coll., 2005|biblio/15930823]]); the Hi-C contact map suggests that their
+arms interact with each other almost as much as with themselves.
+Inter-chromosomal contacts are much more rare in comparison.
 
 Mitochondrial gene order differs even within the _Ciona_ genus ([[Gissi,
 Iannelli and Pesole 2004|biblio/15114417]]).