RT clamping.

diff --git a/biblio/20876692.mdwn b/biblio/20876692.mdwn
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--- a/biblio/20876692.mdwn
+++ b/biblio/20876692.mdwn
@@ -1,5 +1,5 @@
 [[!meta title="Reverse transcriptases can clamp together nucleic acids strands with two complementary bases at their 3'-termini for initiating DNA synthesis."]]
-[[!tag template_switching enzyme manganese]]
+[[!tag reverse_transcription template_switching enzyme manganese]]
 
 Oz-Gleenberg I, Herschhorn A, Hizi A.
 

diff --git a/tags/reverse_transcription.mdwn b/tags/reverse_transcription.mdwn
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--- a/tags/reverse_transcription.mdwn
+++ b/tags/reverse_transcription.mdwn
@@ -11,6 +11,7 @@ _(redaction in progress)_
  - [[T4 bacteriophage gene 32 protein|ssbp]] (T4gp32, [[Kenzelmann _et al._, 2004|biblio/15028277]],
    [[Piché _et al._, 2005|biblio/16461948]]).
 
+
 ### DNA-dependent DNA polymerase activity
 
  - It is utilised in [[template_switching]] methods to add linkers to first-strand cDNAs.
@@ -20,6 +21,16 @@ _(redaction in progress)_
    artefacts ([[Perocchi et al., 2007|biblio/17897965]], [[Kanamori-Katayama et al., 2011|biblio/21596820]]).
  - Its error profile is different from other DNA polymerases ([[de Paz et al., 2018|biblio/29718339]]).
 
+
+### Clamping activity
+
+ - Reverse transcriptases can bind duplexes that are only annealed through a
+   2-nt homology.  A single nucleotide is not enough and GC-rich sequences are
+   strongly favoured.  This binding is enhanced by dGTP.  The assays demonstrating
+   this used an ELISA approach ([[Oz-Gleenberg, Herschhorn and Hizi,
+   2011|biblio/20876692]]).
+
+
 ### Terminal desoxynucleotidyl transferase (TdT) activity
 
 Like other DNA polymerases ([[Clark, 1988|biblio/2460825]]), reverse