I carried out a BLASTp search for protein A1 from organism A. It produced a match for protein B1 from organism B. When I then conducted a BLASTp search for protein B1 there was no match for protein A1. Why is this?
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Read rule #5 here: https://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1002202
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