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Question on GENETICS: Why do some protein patterns have a high probability of detection in any given protein?

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I ran a protein sequence in a BLAST tool and there were a number of "high probability hits". Why do these patterns have a high probability?

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  1. May be  they are nature's choice.  


  2. It all depends on the pool of proteins you collected.The Blast Tool utilized

    speciific enzymes that breaksdown protein sequences into smaller fragments and as the pool increases and with the limited number of enzymes you will see a collection of similarities.

  3. Because BLAST has a huge protein database. They have aminoacid sequences/order of almost any protein. Then, BLAST compares your sequence with its database and they found out which proteins have your sequence, and which of them has more "coincidences". (you know that related proteins have very similar aminoacidic sequences).

    That program works with an algorithm and probabilities, that's all.

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