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Hi folks, I have a long string of DNA sequences, and I need to remove several lines, as well as the line directly following them. For example, here is a sample of my starting material:
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This is probably common knowledge, but I am a beginner at bioinformatics!

I want a list of my sequence names, without sequence or any of the free text after the space. This is some example file:
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I did some past data manipulations using awk so I could join lines in order to use grep. Now that I have newly searched data I need to insert a new line break to use further statistical packages. I...