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<head>
<title>
VEN, VENN
</title>
</head>
<h1 align=center>
VEN, VENN
</h1>
<hr size="3">
<font color=#880000>
<b>
NAME
<br>
</b>
</font>
VEN, VENN - draw Venn diagram.
<br><br>
<font color=#880000>
<b>
SYNOPSIS
<br>
</b>
</font>
VEN
<br>
VEN OFF
<br>
VEN start_index end_index
<br>
VENN
<br>
VENN OFF
<br>
VENN start_index end_index
<br><br>
<font color=#880000>
<b>
DESCRIPTION
<br>
</b>
</font>
Draw Venn diagram for the given protein sequence or sequence fragment.
Venn diagram gives the quick statistical overview of the protein sequence:
count of residues and residue types. It is primarily intended for students.
Experts will not find this routine very interesting.
<br><br>
<img src="venn.gif">
<br><br>
<font color=#880000>
<b>
KEYWORDS AND PARAMETERS
<br>
</b>
</font>
The command VENN may be used alone, combined with the keyword OFF or with
two residue numbers. Note that from version 1.4, residue array indices are
used instead of serial indices! There was some mess with the structures
which consist of multiple chains, so the actual residue numbers (related
to array indices) proved to be more reliable than the serial numbers. If you
specify the residue range from 1 to 100, the residues having the array
indices between 0 and 99 will be used. This is because the lowest array index
in the C programming language is zero, not one.
<br><br>
If used alone, the Venn diagram will be drawn for the entire sequence stored
in the main sequence buffer. Two residue array indices (shifted for one) may
be used to specify the residue range. The keyword OFF is used to return to
the main drawing mode (structure drawing mode).
<br><br>
<font color=#880000>
<b>
EXAMPLES
<br>
</b>
</font>
<table border=2 cellspacing=2 cellpading=0>
<td align="left">
COMMAND
</td>
<td align="left">
DESCRIPTION
</td>
<tr>
<td align="left">
load 2por.pdb
<br>
seq from 1
<br>
ven
</td>
<td align="left">
Load the specified structure (porin),
<br>
copy the sequence from this structure
<br>
to the main sequence buffer and draw
<br>
Venn diagram.
</td>
<tr>
<td align="left">
ven 1-100
</td>
<td align="left">
Prepare Venn diagram with counts, but
<br>
only for the first hundred residues,
<br>
having the array indices from 0 to 99.
</td>
<tr>
<td align="left">
ven off
</td>
<td align="left">
Return to default drawing mode.
<br>
Instead using this command,
<br>
you can hit the ESCAPE key.
</td>
</table>
<br>
<font color=#880000>
<b>
NOTES
<br>
</b>
</font>
(1) Instead using the command VENN OFF, the ESCAPE key may be pressed to
return to the main drawing mode.
<br><br>
(2) Ven diagram is a term from the set theory, which is part of mathematics.
Different sorts of Venn diagrams may be found in different branches of
science.
<br><br>
<font color=#880000>
<b>
RELATED COMMANDS
<br>
</b>
</font>
SEQUENCE is used to copy, define or load the sequence.
<br><br>
<hr size="3">
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