Thanks much. The problem was with an occasionally NULL value.

To clean up the sequence data and make it suitable for other tools, I needed to convert it to upper case and break up the sequence and associated info into lines of 80 characters or less.

I've made several of the optimizations and will try another run soon.

In reply to Re^2: Finding error: uninitialized value in concatenation? by bwelch
in thread Finding error: uninitialized value in concatenation? by bwelch

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