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Reformat cut off the end of my sequence.

One possible reason is that your input sequence was in one long line without carriage returns. This can happen if you typed the sequence in something like SimpleText, without carriage returns, and then transferred it to helix. There are several ways around this: It is always worth checking the output from a reformatting program! You don't need to examine the whole sequence, just look at the beginning, the end and the length of the sequence.