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+<HEAD>
+<TITLE> Summary of mask commands</TITLE>
+</HEAD>
+<BODY><P>
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+<H2><A NAME=SECTION00013100000000000000> Summary of mask commands</A></H2>
+<P>
+mask SETUP
+#Prepares for masking
+<P>
+mask LEGAL <qstring>
+#defines characters to include in ID or FRE calcs - optional.
+<P>
+mask ILLEGAL <qstring>
+#defines characters to exclude in ID or FRE calcs - optional.
+<P>
+mask ID ALL N
+#Calculates a mask that flags the character that occurs at least N
+times at a position. The word ALL can be substituted by four numbers
+that define a region of the alignment.
+<P>
+mask FRE ALL
+#calculates a mask that flags the most frequently occuring amino acid
+at each position. ALL may be replaced by four numbers defining a region
+of the alignment.
+<P>
+Multiple mask FRE or mask ID commands may be applied, using different
+LEGAL and ILLEGAL character definitions. In this way more complex
+effects can be built up.
+<P>
+The mask command also allows characters that are identical to one
+sequence to be masked.
+<P>
+mask AGREE ALL N
+<P>
+will mask all positions that are identical to the Nth sequence. Thus,
+for sequences that are very similar to a newly sequenced sequence, all
+characters identical to the new sequence can be boxed or shaded, or set
+in a different font or colour etc...
+<P>
+mask NOT ALL
+<P>
+allows the mask to be inverted. Thus, all positions that are NOT in the
+mask now form the mask. So, having done a mask AGREE, a mask NOT will
+allow the positions that are not identical to the selected sequence to
+be highlighted or substituted.
+<P>
+mask SUB ALL <char>
+<P>
+substitutes all characters in the mask with the character <char>.
+<P>
+mask REGION ALL
+applies a mask to all residues in the defined region.
+<P>
+The following effects can now be applied to the masked characters:
+<P>
+mask BOX ALL
+#boxes the masked residues - ie surrounds them by lines.
+<P>
+mask SHADE ALL <grey>
+#shades the masked residues by grey value.
+<P>
+mask FONT ALL <fontnum>
+#Uses font fontnum to output the masked residues.
+<P>
+mask INVERSE ALL
+#Inverts the masked characters - ie outputs them in white.
+<P>
+mask CCOL ALL <colnum>
+#outputs the masked characters in the defined colour.
+<P>
+mask SCOL ALL <colnum>
+#outputs the backgrounds of the masked characters in the defined
+colour.
+<P>
+In all commands, the word ALL can be replaced by four numbers defining
+the region to which the command is applied.
+<P>
+mask RESET
+#resets the entire mask for re-use
+<P>
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+<HR>
+
+</BODY>
+<P><ADDRESS>
+gjb@bioch.ox.ac.uk
+</ADDRESS>
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