BLAST Tutorial Series: Comparing two or more DNA sequences

thank you for clear explanation

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Thank you for this video!

thanks a lot for the calrification

Thanks

Thanks for the help !! from france

Hi! I've blast a pair of sequences (wildtype vs mutant), doing it exactly as the tutorial shows, but in the "aligments" section there are some "aaaa" in the query sequence, this is:
Query 1440 TGAACATGAGAATATTTTCAAAGTAGGCTCATTAGCATTaaaaaaaaTCAATGAATTACC 1499
Sbjct 1441 ............................................................ 1500


Could anyone please explain to me what are these "aaaaaaaa" meaning? I'm making ARMS-PCR primers

Many Thanks for the informative video!