From: gmungoc
Selecting this option causes the colour scheme to be applied to only those residues that occur in that column more than a certain - percentage of the time. For instance selecting the threshold to be - 100 will only colour those columns with 100 % identity. This - threshold option can be applied to the Zappo, Taylor, Hydrophobicity - and User colour schemes.
+ percentage of the time. For instance, selecting the threshold to be + 100 will only colour those columns with 100% identity. +To be coloured, a residue must match the consensus (most commonly occurring) residue for the column (or joint equal consensus).
+The percentage calculation may include or exclude gaps in the column, depending on the option selected for the consensus calculation.
+With a threshold of 0, colouring is unchanged (including non-consensus residues).