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23 <title>Alignment Conservation Annotation</title>
27 <strong>Alignment Conservation Annotation</strong>
30 This is an automatically calculated quantitative alignment
31 annotation which measures the number of conserved physico-chemical
32 properties conserved for each column of the alignment. Its
33 calculation is based on the one used in the AMAS method of multiple
34 sequence alignment analysis :<br>
36 Livingstone C.D. and Barton G.J. (1993), Protein Sequence
37 Alignments: A Strategy for the Hierarchical Analysis of Residue
40 <b>9</b> No. 6 (745-756)).
43 href="http://www.compbio.dundee.ac.uk/papers/amas/amas3d.html">View
44 an HTML version of the paper</a></em>
47 Conservation is measured as a numerical index reflecting the
48 conservation of <a href="../misc/aaproperties.html">physico-chemical
49 properties</a> in the alignment: Identities score highest, and the
50 next most conserved group contain substitutions to amino acids lying
51 in the same physico-chemical class.
53 <p>Conservation is visualised on the alignment or a sequence group
54 as a histogram giving the score for each column. Conserved columns
55 are indicated by '*' (score of 11 with default amino acid property
56 grouping), and columns with mutations where all properties are
57 conserved are marked with a '+' (score of 10, indicating all
58 properties are conserved).</p>
60 Mousing over a conservation histogram reveals a tooltip which
61 contains a series of symbols corresponding to the physicochemical
62 properties that are conserved amongst the amino acids observed at
63 each position. In these tooltips, the presence of <em>!</em> implies
64 that the lack of a particular physicochemical property is conserved
68 <strong>Colouring an alignment by conservation</strong><br>
69 Conservation scores can be used to colour an alignment. This is
70 explained further in the help page for <a
71 href="../colourSchemes/conservation.html">conservation
75 <strong>Group conservation</strong><br> If sequence groups have
76 been defined, then selecting option 'Group Conservation' in the <a
77 href="../menus/alwannotation.html">Annotations menu</a> will
78 result in Conservation being calculated for each group, as well as
79 the alignment as a whole.