That worked! Thank you much! To answer your question, the first goal is basically highlighting. What I eventually want to do with it is let a user type in the starting characters of a known piece of the sequence (which he gets from another source) until he gets one highlighted area. Then do the same thing for the last part of the sequence, then be able to take the area between the two highlighted sequences and do what's called a Blast, which tries to find that sequence in another species.