+\exstep{Select a region of the alignment, then add in some additional columns to
+the selection, and experiment with the `Hide all but selected region' function
+in {\sl View $\Rightarrow$ Hide $\Rightarrow$ All but selected region.}}
+\exstep{Select some sequences and pick one to represent the rest by hoovering
+the mouse over this sequence. Bring up the Sequence ID pop-up menu by right
+clicking and then seelct {\sl (Sequence ID name) $\Rightarrow$ Represent group
+with (Sequence ID name )}. To reveal these hidden sequences, right click on the
+Sequence ID and in the the pop-up menu select Reveal All.}}